When you start a Python project on Ubuntu 26.04, you already have a Python interpreter available. The usual setup work is installing pip, adding the venv module, or installing a separate Python version for a project that needs something other than Ubuntu’s default Python.

This guide explains how to install Python tooling on Ubuntu 26.04, how to use the deadsnakes PPA for alternate Python versions, and how to build Python from source when you need a specific upstream release.

Ubuntu 26.04 Default Python Version #

Ubuntu 26.04 ships with Python 3.14 as the default Python 3 interpreter. To check the version on your system, run:

python3 --version

Python 3.14.1

The exact patch version may change as Ubuntu publishes updates, but the default interpreter remains Python 3.14. Most users should keep this interpreter in place and use virtual environments for project packages.

Do not replace the /usr/bin/python3 interpreter. Ubuntu tools expect the distribution-provided Python version. If a project needs a different Python release, install it alongside the default interpreter and call it by its versioned command, such as python3.13 or python3.15.

Quick Reference #

Installing pip and venv for the Default Python #

If Ubuntu’s default Python 3.14 is enough for your work, install pip and the virtual environment module from the Ubuntu repositories.

First, update the package index:

sudo apt update

Install pip and the virtual environment module:

sudo apt install python3-pip python3-venv

Verify the installed commands:

python3 --version
pip3 --version

On Ubuntu 26.04, python3 points to Python 3.14. Use a virtual environment for project dependencies instead of installing packages into the system Python environment.

Create a virtual environment with the default Python:

python3 -m venv myproject

Activate it:

source myproject/bin/activate

Inside the environment, python and pip point to the isolated project environment:

python --version
python -m pip --version

When you are done working in the project, deactivate the environment:

deactivate

Installing Python from the Deadsnakes PPA #

The deadsnakes PPA provides alternate Python versions packaged for Ubuntu. It now supports Ubuntu 26.04, including packages for Python versions that Ubuntu does not provide as the default interpreter.

Deadsnakes does not provide Python 3.14 for Ubuntu 26.04 because Ubuntu already includes Python 3.14. Use the PPA when you need another interpreter, such as Python 3.13 or the Python 3.15 preview builds.

1. Install the prerequisites and add the PPA:

   Terminal

   sudo apt update
   sudo apt install software-properties-common
   sudo add-apt-repository ppa:deadsnakes/ppa

   Press Enter when prompted to confirm.

2. Install Python 3.13:

   Terminal

   sudo apt update
   sudo apt install python3.13

   To install the Python 3.15 preview package instead, replace python3.13 with python3.15:

   Terminal

   sudo apt install python3.15

   Python 3.15 is still a preview release, so use it for testing rather than production workloads.

3. Verify the installation:

   Terminal

   python3.13 --version

   The command prints the installed Python 3.13 patch release. You can also confirm the binary location:

   Terminal

   which python3.13

4. Install the venv module for the same interpreter:

   Terminal

   sudo apt install python3.13-venv

   If you installed Python 3.15, use:

   Terminal

   sudo apt install python3.15-venv

5. Create a virtual environment and use pip inside it:

   Terminal

   python3.13 -m venv myproject
   source myproject/bin/activate
   python -m pip install --upgrade pip

Installing Python from Source #

Compiling Python from source allows you to install any version and customize the build options. However, you will not be able to manage the installation through the apt package manager.

The following steps show how to compile Python 3.14.4. If you are installing a different version, replace the version number in the commands below.

1. Install the libraries and dependencies required to build Python:

   Terminal

   sudo apt update
   sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev liblzma-dev

2. Download the source code from the Python download page using wget :

   Terminal

   wget https://www.python.org/ftp/python/3.14.4/Python-3.14.4.tgz

3. Extract the archive :

   Terminal

   tar -xf Python-3.14.4.tgz

4. Navigate to the source directory and run the configure script:

   Terminal

   cd Python-3.14.4
   ./configure --enable-optimizations

   The --enable-optimizations flag runs profile-guided optimization tests, which makes the build slower but produces a faster Python binary.

5. Start the build process:

   Terminal

   make -j $(nproc)

   The -j $(nproc) option uses all available CPU cores for a faster build.

6. Install the Python binaries using altinstall. Do not use install, as it overwrites the system python3 binary and can break system tools that depend on it:

   Terminal

   sudo make altinstall

7. Verify the installation:

   Terminal

   python3.14 --version

   output

   Python 3.14.4

Setting Up a Virtual Environment #

After installing a new Python version, create a virtual environment for your project to keep dependencies isolated:

python3.13 -m venv myproject

Activate the virtual environment:

source myproject/bin/activate

Your shell prompt will change to show the environment name. Inside the virtual environment, python and pip point to the version you used to create it.

For a source-built Python 3.14 installation, use the versioned command:

python3.14 -m venv myproject

To deactivate the virtual environment:

deactivate

For more details, see our guide on how to create Python virtual environments .

Optional: Uninstalling the PPA Version #

To remove the PPA version:

sudo apt remove python3.13 python3.13-venv

To remove the PPA itself:

sudo add-apt-repository --remove ppa:deadsnakes/ppa

Troubleshooting #

python3 already exists after installation
This is expected. Ubuntu 26.04 includes Python 3.14 by default, so the default setup usually adds missing tools such as pip3 or venv.

pip reports an externally managed environment
Ubuntu protects system-managed Python packages. Create a virtual environment with python3 -m venv myproject, activate it, and install packages with python -m pip install package-name inside the environment.

No module named venv
Install the matching venv package. For Ubuntu’s default Python, run sudo apt install python3-venv. For Python 3.13 from the PPA, run sudo apt install python3.13-venv.

Unable to locate package python3.13 or python3.15
Run sudo apt update after adding the deadsnakes PPA. If the package is still unavailable, check that the PPA supports your Ubuntu release and CPU architecture.

python3 still shows Python 3.14
The python3 command should continue to use Ubuntu’s default interpreter. Run the alternate version with its versioned command, such as python3.13 or python3.15.

Python 3.15 shows an alpha version
Python 3.15 is still a preview release. Use it for testing compatibility, and use Python 3.14 or another stable release for production projects.

FAQ #

Should I use the PPA or build from source?
Use the Ubuntu packages if Python 3.14 is enough. Use the deadsnakes PPA when you need an alternate packaged interpreter such as Python 3.13 or a Python 3.15 preview. Build from source only if you need a specific upstream patch release or a custom build configuration.

Will installing a new Python version break my system?
No. Both methods install the new version alongside the system Python 3.14. The system python3 command is not affected. You access the alternate version with python3.13, python3.15, or another explicit version command.

How do I make the new Python version the default?
You can use update-alternatives to configure it, but this is not recommended. Many Ubuntu system tools depend on the default python3 being the version that shipped with the OS. Use virtual environments instead.

How do I install pip for the new Python version?
The recommended approach is to use a virtual environment. Install the matching venv package, create a venv, activate it, and use python -m pip inside the environment.

What is the difference between install and altinstall when building from source?
altinstall installs a versioned binary such as python3.14 without creating a python3 symlink. install creates the symlink, which overwrites the system Python and can break Ubuntu system tools.

Does Ubuntu 26.04 include pip by default?
Ubuntu 26.04 includes Python 3.14 but does not include pip in the base installation. Install it with sudo apt install python3-pip. For alternate Python versions, use python -m pip inside a virtual environment.

Conclusion #

Stick with Ubuntu’s Python 3.14 plus python3-pip and python3-venv for most projects. Reach for the deadsnakes PPA when a project pins to 3.13 or wants to test the 3.15 preview, and build from source only for a specific upstream patch.

For more on Python package management, see our guide on how to use pip .

When a script reads a CSV row, a colon-separated config line, or a piece of user input, one of the first things you usually need to do is break that string into its individual fields. Bash does not have a dedicated split function, but the shell gives you several ways to do the job with nothing more than built-ins and common core utilities.

This guide explains how to split a string by a delimiter in Bash using read, the IFS variable, tr, awk, and parameter expansion, with safe examples you can drop straight into a script.

The IFS Variable #

Word splitting in Bash is controlled by the internal field separator, stored in the IFS variable. By default, IFS contains a space, a tab, and a newline, which is why unquoted expansions split on whitespace. When you set IFS to a single character such as a comma or a colon, Bash uses that character to decide where one field ends and the next begins.

Most of the techniques below work by changing IFS for one command only, so the rest of the script keeps the default behavior.

Splitting a String with read #

The cleanest way to split a string into named variables is the read built-in combined with a temporary IFS:

#!/bin/bash

STR="ubuntu:debian:fedora:arch"
IFS=":" read -r first second third fourth <<< "$STR"

echo "$first"
echo "$second"
echo "$third"
echo "$fourth"

Running the script produces one field per line:

ubuntu
debian
fedora
arch

The IFS=":" assignment applies only to the read command that follows it, so the global IFS stays untouched. The here-string (<<<) feeds the string into read on standard input, and -r keeps backslashes literal so they are not treated as escape characters.

Splitting Into a Bash Array #

When the number of fields is not known ahead of time, split the string into an array instead of a fixed list of variables. Pass -a to read to tell it the target is an array:

#!/bin/bash

STR="1,2,3,4,5"
IFS="," read -r -a numbers <<< "$STR"

for n in "${numbers[@]}"; do
 echo "$n"
done

The numbers array now holds one value per comma-separated field, and the loop prints each one on its own line. Always expand arrays with "${numbers[@]}" inside double quotes so elements that contain spaces stay intact.

For a deeper look at what else arrays can do, see our guide on Bash arrays .

Splitting With a Multi-Character Delimiter #

IFS treats each character in its value as a separate delimiter, so setting IFS="::" will still split on single colons. For a multi-character delimiter such as :: or -, convert it to a single character first with sed or use parameter expansion:

#!/bin/bash

STR="alpha::beta::gamma"
IFS="|" read -r -a parts <<< "${STR//::/|}"

for p in "${parts[@]}"; do
 echo "$p"
done

The ${STR//::/|} expansion replaces every occurrence of :: with a pipe character, and then read splits the resulting string on the pipe. Pick a placeholder character that you are sure the input does not contain.

Splitting With tr #

When you only need the fields printed one per line, tr is often enough. It translates the delimiter into a newline:

printf '%s\n' "red,green,blue" | tr ',' '\n'

red
green
blue

This approach pairs well with pipelines. For example, you can count the number of fields by piping the output into wc -l, or loop over the values with a while read block:

#!/bin/bash

STR="red,green,blue"

while IFS= read -r color; do
 echo "Color: $color"
done < <(printf '%s\n' "$STR" | tr ',' '\n')

The process substitution <(...) sends the output of the pipeline into the loop without using a subshell for the loop body, so any variables you set inside the loop remain available after it ends.

Splitting With awk #

For more structured splitting, awk is the right tool. It reads input one record at a time and exposes each field as $1, $2, and so on. Use -F to set the field separator:

echo "jane:x:1001:1001:Jane Doe:/home/jane:/bin/bash" | awk -F':' '{ print $1, $5 }'

jane Jane Doe

awk is also a good pick when the delimiter is a regular expression, when you need to skip a header line, or when you want to act on a specific field without touching the rest. For more patterns, see our awk command guide .

Splitting With Parameter Expansion #

Bash parameter expansion can pull a prefix or a suffix off a string without calling any external command. This is the fastest option when you only need one part, not all of them:

#!/bin/bash

PATH_LINE="/usr/local/bin/script.sh"

BASE="${PATH_LINE##*/}"
DIR="${PATH_LINE%/*}"

echo "Directory: $DIR"
echo "Basename: $BASE"

Directory: /usr/local/bin
Basename: script.sh

##*/ strips the longest match of */ from the start of the string, leaving the basename. %/* strips the shortest match of /* from the end, leaving the directory. The same pattern works for any delimiter, not only the slash.

For full coverage of these expansions, see our guide on Bash string manipulation .

Preserving Empty Fields #

A common surprise with read is that trailing empty fields can be dropped. Consider the string a,,b,:

#!/bin/bash

STR="a,,b,"
IFS="," read -r -a fields <<< "${STR},"

echo "Count: ${#fields[@]}"
printf '[%s]\n' "${fields[@]}"

Count: 4
[a]
[]
[b]
[]

Bash keeps empty fields in the middle, but read -a drops a trailing empty field when the delimiter is the last character. Appending one extra delimiter before reading gives read a final empty value to assign, which preserves the trailing field from the original string.

Quick Reference #

The table below summarizes which technique to reach for based on what the script needs to do.

For a printable quick reference, see the bash cheatsheet .

FAQ #

How do I split a string by whitespace in Bash?
Leave IFS at its default and use read -r -a arr <<< "$STR". Any run of spaces, tabs, or newlines will act as a separator.

Why does my array lose the last empty field?
If the delimiter is at the very end of the string, read -a can drop the trailing empty element. Append one extra delimiter before reading, for example IFS=',' read -r -a arr <<< "${STR},", when the trailing empty field matters.

Can I split on a newline?
Yes. For line-based strings, use mapfile -t lines <<< "$STR" so each input line becomes one array element. Plain read stops at the first newline unless you change how it reads the input.

Is there a built-in split function in Bash?
No. Word splitting driven by IFS plus the read built-in is the idiomatic replacement for a dedicated split function.

Conclusion #

Splitting strings in Bash comes down to picking the right tool for the shape of the input: read with IFS for structured parsing, tr or awk for pipelines, and parameter expansion for quick prefix or suffix work. When the input is untrusted, quote every expansion and handle empty fields on purpose rather than by accident.

A fresh Ubuntu 26.04 server ships with root SSH access, no regular user, and no firewall rules. That works for the first login, but it is not a safe state to leave running on a public VPS.

This guide walks through the first tasks to perform on a new Ubuntu 26.04 server: creating a sudo user, enabling SSH key authentication, locking down SSH, configuring UFW, setting the hostname and timezone, and applying package updates.

Quick Reference #

Prerequisites #

Before starting, make sure you have:

• A new Ubuntu 26.04 server with a public IP address.
• Root access over SSH, either with a password or a provider-supplied key.
• A local SSH key pair on your workstation. If you do not have one yet, see how to generate SSH keys on Linux .
• Access to the provider web console as a backup path in case SSH access stops working.

Keep your original root SSH session open until you have tested the new user login and the hardened SSH configuration.

Log In as Root #

Open a terminal on your local machine and connect to the server using the public IP address from your hosting provider:

ssh root@server_ip_address

Accept the host key when prompted and enter the root password if password authentication is still enabled. If your provider created the server with an SSH key, the connection should use that key automatically.

Create a New Sudo User #

Working as root for daily administration is risky because every command runs with full privileges. Create a regular user account and give it administrative access through the sudo group.

Replace username with the account name you want to use:

adduser username

The command prompts for a password and optional user details. Enter a strong password, then press Enter to skip any fields you do not need.

Add the new user to the sudo group:

usermod -aG sudo username

The account can now run administrative commands with sudo.

Set Up SSH Key Authentication #

SSH keys are safer than password logins and are easier to use once configured. The exact command depends on where your public key is currently stored.

If your public key is already present under the root account, copy the root SSH directory to the new user:

rsync --archive --chown=username:username /root/.ssh /home/username

If you need to copy a key from your local workstation, run this command from the local machine:

ssh-copy-id username@server_ip_address

Open a new terminal window and test the login before changing the SSH server configuration:

ssh username@server_ip_address

The connection should succeed as the new user. Keep both the root session and the new user session open while you continue.

Disable Root Login and Password Authentication #

After key-based login works, configure OpenSSH to reject direct root logins and password authentication. Ubuntu includes files from /etc/ssh/sshd_config.d/, which keeps local changes separate from the main SSH configuration file.

Create a hardening snippet:

sudo nano /etc/ssh/sshd_config.d/99-hardening.conf

Add the following lines:

PermitRootLogin no
PasswordAuthentication no

Save the file and test the SSH configuration syntax:

sudo sshd -t

If the command prints no output, the configuration is valid. Reload SSH to apply the change:

sudo systemctl reload ssh

Open another terminal and confirm that you can still log in as the regular user:

ssh username@server_ip_address

Do not close your existing sessions until this test succeeds.

Set Up the Firewall with UFW #

Ubuntu uses UFW (Uncomplicated Firewall) as a simple front-end for managing host firewall rules. Start by allowing SSH so the firewall does not block your current access:

sudo ufw allow OpenSSH

Enable the firewall:

sudo ufw enable

Confirm the prompt with y, then check the active rules:

sudo ufw status

The output should show that OpenSSH is allowed:

Status: active
To Action From
-- ------ ----
OpenSSH ALLOW Anywhere
OpenSSH (v6) ALLOW Anywhere (v6)

When you install services such as Nginx or Apache, open their profiles before expecting traffic to reach them. For example, an Nginx server that should accept HTTP and HTTPS traffic needs:

sudo ufw allow 'Nginx Full'

For more examples, see how to set up a firewall with UFW .

Set the Hostname #

A descriptive hostname makes logs, shell prompts, monitoring alerts, and dashboards easier to read. Set the hostname with hostnamectl:

sudo hostnamectl set-hostname server-name

Replace server-name with a short name that matches the server role, such as web-01 or db-01.

Check the result:

hostnamectl

You can update DNS records or your local SSH config separately if you want to connect by name instead of IP address.

Set the Timezone #

Set the server timezone so logs, cron jobs, and timestamps match the region you use for operations:

sudo timedatectl set-timezone Europe/Berlin

List available zones if you are unsure of the exact name:

timedatectl list-timezones

See how to set or change the timezone on Ubuntu for a deeper explanation.

Update the System #

Refresh the package index and install pending updates:

sudo apt update
sudo apt upgrade

If the upgrade installed a new kernel or core system libraries, reboot the server:

sudo reboot

After the reboot, reconnect as the regular sudo user:

ssh username@server_ip_address

Troubleshooting #

Locked out after disabling password authentication
Use your provider web console or recovery mode to log in. Edit /etc/ssh/sshd_config.d/99-hardening.conf, temporarily set PasswordAuthentication yes, run sudo sshd -t, reload SSH, and test key login again before disabling passwords.

usermod: group 'sudo' does not exist
Some minimal images may not include the sudo package. Install it with apt install sudo, then rerun usermod -aG sudo username.

sshd -t reports an error
Read the line number in the error message, fix the snippet in /etc/ssh/sshd_config.d/99-hardening.conf, and run sudo sshd -t again. Do not reload SSH until the syntax test passes.

UFW blocks an expected service
Check the active rules with sudo ufw status. Allow the needed service profile or port, such as sudo ufw allow 'Nginx Full' for Nginx web traffic, then test the connection again.

Conclusion #

You now have an Ubuntu 26.04 server with a sudo user, key-based SSH access, direct root logins disabled, a basic firewall, and current packages. A good next step is to enable automatic security updates before installing the rest of your stack.

When something on a server is holding port 80, a connection is refusing to close, or a service is not reachable from the outside, the first question is almost always the same: what is actually listening, and who is talking to whom. For years, the answer on Linux was the netstat command.

netstat is part of the classic net-tools package and prints network connections, listening ports, routing tables, interface counters, and per-protocol statistics. It has been deprecated in favor of ss and ip , but it is still installed on many systems and the tool many sysadmins reach for first. This guide explains how to read its output and which flags cover the cases you run into day to day.

Install netstat #

On most modern distributions, net-tools is not installed by default. If netstat is not available, install it with your package manager.

On Ubuntu, Debian, and Derivatives:

sudo apt install net-tools

On Fedora, RHEL, and Derivatives:

sudo dnf install net-tools

Once the package is installed, verify the binary is on your path:

netstat --version

netstat Syntax #

The general form of the command is:

netstat [OPTIONS]

Run without options, netstat prints a list of open non-listening sockets, which is rarely what you want. In practice, you almost always pass a combination of flags that describe what kind of sockets you care about (TCP, UDP, Unix), what state they are in, and how you want the output formatted.

List All Connections #

To list every connection, both listening and established, use the -a option:

sudo netstat -a

The output is divided into two parts. The top lists Internet sockets with columns for protocol, receive and send queue sizes, local and foreign address, and state. The bottom lists Unix domain sockets used for local inter-process communication.

Running netstat with sudo is recommended because without it, the command cannot read socket ownership for processes that belong to other users.

Show TCP and UDP Connections #

The -t and -u flags filter the output by protocol. To show only TCP connections:

sudo netstat -at

To show only UDP connections:

sudo netstat -au

You can combine both flags to get TCP and UDP together:

sudo netstat -atu

Show Listening Ports #

When you want to know which services are accepting new connections, use the -l option. For TCP, it restricts the output to sockets in the LISTEN state. UDP does not use the same connection states, but UDP sockets that are ready to receive traffic are still shown.

sudo netstat -tuln

The combined flags read as: show TCP (-t) and UDP (-u) sockets that are listening (-l), with numeric addresses and ports (-n). The output looks similar to this:

Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
tcp6 0 0 :::80 :::* LISTEN
udp 0 0 0.0.0.0:68 0.0.0.0:*

From the output, we can see that SSH is listening on all interfaces on port 22, MySQL is bound to localhost only on port 3306, and a web server is listening on port 80 over IPv6.

Show the Process Using a Port #

To find out which program owns a socket, add the -p option. It prints the PID and the process name next to each connection:

sudo netstat -tulnp

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 812/sshd
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 1034/mysqld
tcp6 0 0 :::80 :::* LISTEN 1591/nginx: master

The PID/Program name column ties each listening port to a process. This is the quickest way to find out which service is holding a port when you get an Address already in use error.

To check one specific port, pipe the output to grep :

sudo netstat -tulnp | grep ':80'

If the command prints a row, a process is listening on port 80. If it prints nothing, no TCP or UDP listener matched that port on the local system.

Show Numeric Output #

By default, netstat resolves IP addresses to hostnames and port numbers to service names (for example, 22 becomes ssh). On a busy system, this can be slow because each address needs a DNS lookup.

The -n option disables name resolution and prints raw numbers:

sudo netstat -n

Numeric output is also easier to pipe into other tools such as grep or awk, because the field values are predictable.

Continuous Monitoring #

The -c option tells netstat to print the output every second until you stop it with Ctrl+C. It is useful when you want to watch a connection appear, change state, and close:

sudo netstat -atnc

Each iteration prints the full table again, so it is best used together with a filter such as grep to isolate a single connection.

Show TCP Connection States #

TCP connections move through states such as ESTABLISHED, LISTEN, TIME_WAIT, and CLOSE_WAIT. To show active TCP sockets with numeric addresses, run:

sudo netstat -ant

The State column tells you where each connection is in the TCP lifecycle:

Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 192.168.1.10:22 192.168.1.5:52710 ESTABLISHED
tcp 0 0 192.168.1.10:80 203.0.113.25:51422 TIME_WAIT
tcp 0 0 127.0.0.1:3306 127.0.0.1:41834 CLOSE_WAIT

ESTABLISHED means the connection is active. TIME_WAIT is normal after a connection closes. A large number of CLOSE_WAIT entries can mean the local application is not closing sockets correctly.

To show only established TCP connections, filter the output:

sudo netstat -ant | grep ESTABLISHED

For new troubleshooting work, ss gives better built-in state filters, such as ss -tn state established.

Count Connections #

On busy web servers, you may want a quick count instead of a full connection table. To count all current TCP connections that involve port 80, run:

sudo netstat -ant | grep ':80' | wc -l

To count only established connections on port 80, add the TCP state to the filter:

sudo netstat -ant | grep ':80' | grep ESTABLISHED | wc -l

These counts are useful as a quick signal, but they are not a replacement for application metrics. The number can change while the pipeline is running, especially on high-traffic systems.

Display the Routing Table #

To print the kernel IP routing table, use the -r option:

netstat -rn

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

The first row is the default route, which sends all traffic not matching another rule to 192.168.1.1. The ip route command from ip is the modern equivalent and is what you should use on new systems.

Interface Statistics #

The -i option prints a per-interface summary that includes received and transmitted packets, errors, drops, and the MTU:

netstat -i

Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP TX-OK TX-ERR TX-DRP Flg
eth0 1500 2345678 0 12 1987654 0 0 BMRU
lo 65536 55432 0 0 55432 0 0 LRU

A growing RX-ERR or TX-ERR column is a hint that you have a cabling, duplex, or driver issue on that interface.

Protocol Statistics #

To print a summary of statistics for each protocol, use -s:

netstat -s

The output is long and grouped by protocol (Ip, Tcp, Udp, and so on). It includes counters such as total packets received, segments retransmitted, and connection resets. You can narrow the output to a single protocol by combining -s with -t or -u:

netstat -st

netstat vs ss #

On modern Linux distributions, ss is the recommended replacement for netstat. It is faster and reads information directly from the kernel through Netlink, with richer filter support. The ip command replaces the routing and interface parts of netstat.

A few common translations:

• netstat -tuln is equivalent to ss -tuln
• netstat -tulnp is equivalent to sudo ss -tulnp
• netstat -s maps to ss -s (a much shorter summary)
• netstat -i maps to ip -s link
• netstat -r maps to ip route

For a full walkthrough of the replacement tool, see the guide on the ss command .

Quick Reference #

For a printable quick reference, see the netstat cheatsheet .

Troubleshooting #

netstat: command not found
The net-tools package is not installed. Install it with your package manager, or use ss instead.

No PID/Program name column shown
You need to run the command with sudo. Without root privileges, netstat cannot read process information for sockets owned by other users.

Output is slow or hangs
DNS resolution is slow or failing. Add the -n option to disable name lookups and print numeric addresses and ports.

A port shows up as LISTEN on :: but not on 0.0.0.0
The service is listening on the IPv6 wildcard address. On systems with dual-stack enabled, this accepts IPv4 traffic too. Check your IPv6 configuration if only IPv4 clients are failing.

FAQ #

Is netstat deprecated?
Yes. The net-tools suite, which includes netstat, ifconfig, and route, has been deprecated for years in favor of the iproute2 tools ss and ip. It is still functional and still shipped by most distributions, but new scripts should target ss and ip.

What is the difference between netstat on Linux and Windows?
The command name is the same, and the general idea is the same, but the flags are different. This guide covers the Linux version from net-tools. On Windows, the closest equivalents to netstat -tulnp are netstat -ano and Get-NetTCPConnection in PowerShell.

How do I find what process is using a specific port?
Run sudo netstat -tulnp | grep ':PORT', replacing PORT with the port number. The last column shows the PID and program name. With ss, the same query is sudo ss -tulnp 'sport = :PORT'.

Why is a port still TIME_WAIT after I stopped the service?
TIME_WAIT is a normal TCP state that keeps a closed connection around for a short period so late packets can be handled safely. The kernel clears these entries automatically, usually within one or two minutes.

Conclusion #

netstat remains useful when you need to inspect network connections on systems that still have net-tools installed. For new scripts and current Linux systems, prefer ss for sockets and ip for routes and interface statistics.

After installing Ubuntu 26.04, the desktop is ready to use, but a few setup steps make the system easier to work with day to day. Updating packages, checking drivers, installing media codecs, setting up backups, and reviewing privacy settings are good first tasks on a new installation.

This guide explains what to do after installing Ubuntu 26.04. The checklist is aimed at desktop users who want a clean, practical setup without adding unnecessary tools.

If you have not installed the system yet, start with our guide on how to install Ubuntu 26.04 . If you moved from an older release, see how to upgrade to Ubuntu 26.04 .

Quick Reference #

Update Ubuntu #

Start by updating the package index and installing available updates. This pulls in security fixes, bug fixes, and package updates released after the installation image was created.

Open a terminal and run:

sudo apt update
sudo apt upgrade

Enter your password when prompted and confirm the upgrade. If the update installs a new kernel or graphics driver, reboot before continuing:

sudo reboot

You can also update from the desktop by opening Software Updater from the application menu.

Install Available Drivers #

Ubuntu detects most hardware automatically, but some systems need proprietary drivers for graphics cards, Wi-Fi adapters, or other devices. This is common on laptops and systems with NVIDIA graphics.

Open Software & Updates, go to the Additional Drivers tab, and wait while Ubuntu checks available drivers. If Ubuntu recommends a proprietary driver, select it and apply the change. Reboot after installing graphics or Wi-Fi drivers.

If you selected the third-party software option during installation, your system may already have the correct driver installed. It is still worth checking this screen once on a new system.

Install Media Codecs #

Ubuntu does not include every media codec by default. If you want better support for common audio and video files, Microsoft fonts, and some archive formats, install the restricted extras package:

sudo apt install ubuntu-restricted-extras

During installation, you may be asked to accept the Microsoft font license. Use the keyboard to select OK, press Enter, then select Yes and press Enter again.

After the package is installed, try playing the video or audio file again. For most desktop users, this package is enough for everyday media playback.

Enable Flatpak and Flathub #

Ubuntu includes Snap support by default, and many applications are available from the Ubuntu App Center. Flatpak is another popular desktop app format, and Flathub provides current builds of many Linux desktop applications.

Install Flatpak and the GNOME Software plugin:

sudo apt install flatpak gnome-software-plugin-flatpak

Add the Flathub repository:

flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Log out and log back in, or reboot, so desktop app integration is fully available:

sudo reboot

After that, you can install Flatpak applications from Flathub or from GNOME Software if the plugin is active.

Install Common Desktop Apps #

A fresh Ubuntu installation includes a browser, file manager, terminal, text editor, and basic utilities. Most users still add a few daily-use applications.

Common choices include:

• A web browser such as Google Chrome , Chromium, Microsoft Edge, or Firefox.
• A media player such as VLC.
• Development tools such as Node.js , Git, Python, Docker, or Visual Studio Code.
• Communication apps such as Slack, Discord, Zoom, or Teams.
• Desktop apps from Flathub when the Ubuntu repositories or Snap packages do not provide the version you want.

Use the Ubuntu App Center for simple desktop installs. Use apt when a package is available in Ubuntu repositories, and use the vendor’s official package only when you need the current upstream version.

Set Up Backups #

Set up backups before you spend too much time customizing the system. Backups are easier to trust when they are configured early and tested before you need them.

Open Settings > System > Backup and choose where to store your backups. An external drive is the simplest option for a single desktop or laptop. If you already use a cloud storage provider or network storage, configure that target instead.

At minimum, back up your home directory, which contains documents, downloads, browser profiles, SSH keys, and most application settings. If you keep important files outside your home directory, include those paths too.

After the first backup finishes, restore one small test file to confirm that the backup is usable.

Review Privacy and Security Settings #

Open Settings > Privacy & Security and review the options that match how you use the computer. On a laptop, pay special attention to location services, screen lock, automatic suspend, and notifications on the lock screen.

Good defaults for most systems are:

• Disable location services unless you use apps that need location access.
• Keep the screen lock enabled.
• Use a short automatic blank-screen delay on laptops.
• Hide notification details on the lock screen if the computer is used in public places.
• Review diagnostics and error reporting options.

If the computer is shared, create separate user accounts instead of sharing one login. Use an administrator account only when needed, and keep daily users separate when possible.

Enable the Firewall #

Ubuntu includes UFW, a simple firewall tool for managing incoming connections. On a typical desktop system, enabling UFW blocks unsolicited inbound traffic while allowing normal outbound connections.

Enable the firewall:

sudo ufw enable

Check the status:

sudo ufw status

Status: active

If you use SSH, file sharing, development servers, or remote desktop tools, allow those services before relying on the firewall rules. For a full command reference, see our UFW firewall guide .

Customize the Desktop #

Ubuntu 26.04 uses the GNOME desktop with Ubuntu’s dock and appearance settings. You can adjust the most common options from Settings > Appearance.

Useful settings to review include:

• Light or dark style.
• Accent color.
• Dock position and auto-hide behavior.
• Desktop icons.
• Default applications.
• Keyboard shortcuts.
• Display scaling for high-resolution screens.

Do not change every option at once. Make a few changes, use the desktop for a day, then adjust anything that still feels awkward.

Install GNOME Tweaks #

GNOME Tweaks exposes settings that are not shown in the default Settings app. It is useful for changing window behavior, fonts, startup applications, and a few interface details.

Install it with:

sudo apt install gnome-tweaks

Open Tweaks from the application menu. If you also use GNOME Shell extensions, install only the extensions you need and remove ones you no longer use. Too many extensions can make desktop upgrades harder to troubleshoot.

Improve Laptop Battery Life #

On laptops, start with the built-in power settings. Open Settings > Power and choose the profile that matches your current use:

• Power Saver for longer battery life.
• Balanced for normal use.
• Performance when you need maximum speed and the laptop is plugged in.

Also review screen brightness, automatic suspend, Bluetooth, and keyboard backlight settings. Small changes here often matter more than installing extra tools.

If you need more control, you can install TLP:

sudo apt install tlp

Start and enable the service:

sudo systemctl enable --now tlp

Use TLP only if you are comfortable troubleshooting power behavior. On many newer laptops, Ubuntu’s built-in power profiles are enough.

Remove Unused Packages #

After installing updates and applications, remove packages that were installed as dependencies but are no longer needed:

sudo apt autoremove

Review the package list before confirming. autoremove is usually safe, but it is still a good habit to read what will be removed.

You can also clear downloaded package files from the local cache:

sudo apt clean

This frees disk space, but it means packages will need to be downloaded again if you reinstall them later.

Check the Ubuntu Version #

After updates and any reboot, confirm that the system is running Ubuntu 26.04:

lsb_release -a

Distributor ID: Ubuntu
Description: Ubuntu 26.04 LTS
Release: 26.04
Codename: resolute

If lsb_release is not installed, you can check /etc/os-release:

cat /etc/os-release

For more options, see how to check your Ubuntu version .

Next Steps #

Once the desktop basics are in place, install the tools you need for your work. Developers may want Docker , Node.js, Git, Python, or Visual Studio Code. Desktop users may want Chrome, VLC, Flatpak apps, printer support, or cloud sync tools.

If you plan to use the machine as a server, create a separate setup plan. Desktop post-install tasks are different from server hardening, SSH access, service configuration, and firewall rules for hosted applications.

Conclusion #

Ubuntu 26.04 works well after a clean installation, but updates, drivers, codecs, backups, firewall settings, and desktop preferences make the system more practical for daily use. Start with the essentials, then add only the applications and customizations you actually need.

Installing Ubuntu 26.04 gives you a fresh long-term support desktop with the current Ubuntu installer, GNOME desktop, and updated system packages. A clean installation is the right choice when you are setting up a new computer, replacing another operating system, or starting over with a known-good system.

This guide explains how to install Ubuntu 26.04 from a bootable USB drive. We will download the ISO, create the installer USB, boot from it, walk through the installer screens, and review the first steps after the system starts.

Prerequisites #

Before you start, make sure you have:

• A computer where you want to install Ubuntu 26.04.
• A USB flash drive with at least 12 GB of storage.
• A reliable internet connection.
• A backup of any files you want to keep from the target computer.

Installing Ubuntu can erase the selected disk. If the computer already contains another operating system or personal files, back up your data before continuing.

If you already run an older Ubuntu release and want to keep your existing setup, see how to upgrade to Ubuntu 26.04 instead of doing a clean install.

Download the Ubuntu 26.04 ISO #

Download the Ubuntu 26.04 Desktop ISO from the official Ubuntu downloads page . Choose the 64-bit desktop image and save it to your computer. The file name should look similar to ubuntu-26.04-desktop-amd64.iso.

If Ubuntu publishes checksum files for the release, verify the ISO before writing it to the USB drive. This step confirms that the file downloaded correctly and was not corrupted.

Create a Bootable Ubuntu USB Drive #

Write the ISO file to a USB flash drive with a tool such as Rufus, balenaEtcher, GNOME Disks, or Startup Disk Creator. The exact steps depend on your current operating system, but the process is the same:

1. Select the Ubuntu 26.04 ISO file.
2. Select the USB flash drive.
3. Start the write process.
4. Wait until the tool finishes and safely ejects the drive.

Boot From the USB Drive #

Insert the USB drive into the computer where you want to install Ubuntu and restart the machine. Open the boot menu during startup and select the USB drive.

The key used to open the boot menu depends on the computer manufacturer. Common keys include F12, F10, F9, Esc, and Del. If the computer starts the existing operating system instead, restart and try the boot-menu key again.

When the Ubuntu boot menu appears, choose Try or Install Ubuntu.

Choose Language and Accessibility Options #

The installer starts with the language screen. Select your preferred language and click Next.

The next screen lets you configure accessibility options before installation. Most users can leave these settings unchanged and continue.

Select Keyboard Layout and Network #

Choose your keyboard layout. If you are unsure, use the text field on the screen to test keys such as quotes, symbols, and special characters.

Next, connect to the internet if the installer asks for network access. A wired Ethernet connection is usually detected automatically. For Wi-Fi, select your network and enter the password.

You can install Ubuntu without internet access, but connecting during installation allows the installer to download updates and third-party packages when those options are selected.

Choose the Installation Type #

When asked what you want to do, select Install Ubuntu.

The Try Ubuntu option starts a live desktop without changing the disk. Use it if you want to test hardware support before installing.

Choose Interactive Installation #

On the next screen, choose Interactive installation. This is the standard installer path for a single desktop computer.

The automated installation option is for advanced deployments where you provide an installation configuration file. Most desktop users should leave it unselected.

Select Apps and Third-Party Software #

Choose the application set you want to install. The default selection is a good fit for most desktop systems. The extended selection installs more applications during setup.

Ubuntu 26.04 uses Default selection for a smaller desktop setup and Extended selection for additional tools such as office utilities. Choose the default option if you want a clean desktop and plan to add applications later. Choose the extended option if you want more applications installed immediately.

The next screen offers proprietary software for graphics and Wi-Fi hardware, along with support for additional media formats.

Enable these options when you have a working internet connection. They can help with NVIDIA graphics, some Wi-Fi adapters, and common media playback.

Choose Disk Setup #

The disk setup screen is the most important part of the installation.

For a clean install on a dedicated computer or virtual machine, choose the option to erase the disk and install Ubuntu. This creates the required partitions automatically.

If you are installing Ubuntu next to another operating system, read the installer options carefully before continuing. Do not erase the disk unless you want to remove the existing operating system and all files on that disk.

Advanced users can choose manual partitioning to control mount points, file systems, and encryption. For most desktop installs, the automatic disk setup is simpler and less error-prone.

Choose Encryption and File System Options #

After choosing the disk setup, select the encryption and file system options. For a basic desktop installation, leave No encryption selected.

If you are installing Ubuntu on a laptop or a computer that stores private data, disk encryption is worth considering. Make sure you can store the recovery key safely, because encrypted data is difficult or impossible to recover without the correct passphrase or recovery key.

Create Your User Account #

Enter your name, computer name, username, and password. Choose a strong password because this account will be used for desktop login and administrative tasks with sudo .

You can choose automatic login if the computer is for personal use in a trusted location. For laptops, shared machines, and work systems, require a password at login.

Select Time Zone #

Select your time zone on the map or search for your city. The installer uses this setting to configure the system clock.

If you are connected to the internet, Ubuntu can usually detect the correct time zone automatically.

Review and Start the Installation #

Before copying files, the installer shows a summary of the selected options. Review the disk, keyboard layout, time zone, and account details.

When everything looks correct, start the installation. Ubuntu will copy files to the disk, install packages, configure the boot loader, and prepare the system for first boot.

The installation can take several minutes depending on your hardware and USB drive speed.

Restart Into Ubuntu 26.04 #

When the installer finishes, restart the computer and remove the USB drive when prompted.

After the reboot, the computer should start from the internal disk and show the Ubuntu login screen or desktop.

Ubuntu may show a short welcome wizard after the first login. Use it to review location services, privacy reporting, appearance, and application suggestions, or skip the options you do not need.

First Steps After Installing Ubuntu 26.04 #

After logging in, open a terminal and update the package index:

sudo apt update

Install available updates:

sudo apt upgrade

You can check your Ubuntu version with:

lsb_release -a

If this is a server or a machine you will access remotely, consider setting up SSH and a firewall. See our guides on enabling SSH on Ubuntu and setting up UFW on Ubuntu .

You may also want to install extra .deb packages for applications that are not available from the Ubuntu repositories. For details, see how to install deb files on Ubuntu .

For a typical desktop setup, you can install Google Chrome on Ubuntu 26.04 and, if you do development work, Docker on Ubuntu 26.04 .

Troubleshooting #

The computer does not boot from the USB drive
Open the boot menu and choose the USB device manually. If the USB drive is not listed, recreate it with another tool or try a different USB port.

The installer freezes or shows a blank screen
Restart and choose the safe graphics option from the Ubuntu boot menu. This can help on systems with graphics drivers that do not work well during installation.

The disk you want to use is not listed
Check the computer firmware settings for storage mode and disk controller options. On some systems, switching from RAID or Intel RST mode to AHCI is required before Linux installers can detect the disk. Back up data before changing storage settings.

Wi-Fi does not work during installation
Install without network access and connect after the first boot. If the Wi-Fi adapter needs third-party drivers, connect with Ethernet or USB tethering, then install updates and additional drivers from Ubuntu.

The system boots back into the installer after installation
Remove the USB drive and reboot. If it still opens the installer, check the boot order in the firmware settings and move the internal disk above the USB device.

FAQ #

Can I install Ubuntu 26.04 without internet access?
Yes. You can install Ubuntu without an internet connection. Updates, language packs, and some third-party packages can be installed after the first boot.

Will installing Ubuntu erase Windows?
It depends on the disk option you choose. Erasing the disk removes Windows and all files on that disk. If you want to keep Windows, choose the install-alongside option when available or use manual partitioning.

How much disk space does Ubuntu 26.04 need?
Ubuntu can install on a modest disk, but a desktop system is more comfortable with at least 25 GB of free space. Use more if you plan to install many applications, keep large files, or run development tools.

Should I choose default or extended installation?
Choose the default selection if you want a smaller desktop setup and plan to install applications as needed. Choose the extended selection if you want more desktop tools installed immediately.

Conclusion #

You now have Ubuntu 26.04 installed and ready to use. After the first login, install updates, confirm that your hardware works, and add only the applications and services you need for your setup.

VirtualBox is a desktop virtualization application that lets you run Linux, Windows, BSD, and other guest operating systems in virtual machines. It is useful for testing software, running lab environments, and keeping experiments separate from your main system.

This guide explains how to install VirtualBox on Ubuntu 26.04 from the Ubuntu multiverse repository.

At publication time, Ubuntu 26.04 packages VirtualBox 7.2 in the Ubuntu repositories. The Oracle VirtualBox APT repository does not yet provide a dedicated resolute repository suite, so the Ubuntu package is the safer install path for this release.

Quick Reference #

Prerequisites #

You need to be logged in as root or as a user with sudo privileges .

If Secure Boot is enabled, Ubuntu may ask you to enroll a Machine Owner Key (MOK) so the VirtualBox kernel modules can load. Follow the on-screen prompts and reboot when asked.

Installing VirtualBox from Ubuntu Repositories #

First, update the package index:

sudo apt update

Enable the multiverse repository if it is not already enabled:

sudo add-apt-repository multiverse

Refresh the package index again:

sudo apt update

Install VirtualBox:

sudo apt install virtualbox

After the installation finishes, check the installed version:

VBoxManage --version

The output prints the installed VirtualBox version:

7.2.6_Ubuntur172322

Installing the VirtualBox Extension Pack #

The VirtualBox Extension Pack adds support for features such as USB 2.0 and USB 3.0 devices, webcam passthrough, disk encryption, and remote display access.

Install the Ubuntu package:

sudo apt install virtualbox-ext-pack

The installer downloads the matching Oracle Extension Pack and asks you to accept the license terms. Read the prompt, then select the confirmation option if you agree.

Verify that the Extension Pack is installed:

VBoxManage list extpacks

Starting VirtualBox #

Open the Activities overview, search for “VirtualBox”, and start it from the application menu.

You can also start VirtualBox from the terminal:

virtualbox

When VirtualBox opens, click “New” to create your first virtual machine:

Uninstalling VirtualBox #

To remove VirtualBox and the Extension Pack:

sudo apt remove virtualbox virtualbox-ext-pack

Remove packages that are no longer needed:

sudo apt autoremove

If you want to remove saved virtual machines, delete them from the VirtualBox interface first or remove the files manually from your home directory. Do this only after you have backed up any virtual machines you still need.

Troubleshooting #

VirtualBox kernel modules do not load
Install the headers for your running kernel and reconfigure VirtualBox:

sudo apt install linux-headers-$(uname -r)
sudo dpkg-reconfigure virtualbox-dkms

Secure Boot blocks VirtualBox modules
Enroll the MOK key when Ubuntu prompts you, then reboot. If you skipped the enrollment screen, reinstall or reconfigure the VirtualBox DKMS package so Ubuntu shows the prompt again.

The virtualbox-ext-pack install stops at a license prompt
Use the keyboard to select the confirmation option in the terminal dialog. If the terminal dialog is hard to read, expand the terminal window and run the install command again.

USB devices do not appear in guest machines
Install the Extension Pack, add your user to the vboxusers group, and log out and back in:

sudo usermod -aG vboxusers $USER

FAQ #

Should I install VirtualBox from Oracle or Ubuntu repositories?
For Ubuntu 26.04, the Ubuntu repository package is the best default choice because it matches the release and kernel packaging. Use the Oracle repository only after Oracle publishes a repository suite for Ubuntu 26.04.

Do I need the Extension Pack?
You only need it for extra features such as USB 2.0/3.0 passthrough and remote display support. Basic virtual machines work without it.

Where are VirtualBox virtual machines stored?
By default, VirtualBox stores virtual machines under ~/VirtualBox VMs/.

Conclusion #

VirtualBox is available on Ubuntu 26.04 from the multiverse repository. After installation, add the Extension Pack only if you need its extra device and remote display features.

TeamViewer is a remote access and support application that lets you connect to another computer over the internet. It supports remote control, file transfer, screen sharing, and unattended access across Linux, Windows, and macOS.

This guide explains how to install TeamViewer on Ubuntu 26.04 using the official .deb package.

Quick Reference #

Prerequisites #

You need to be logged in as root or as a user with sudo privileges .

The command below downloads the x86-64 package. If you are using an ARM device, choose the correct Ubuntu/Debian package from the TeamViewer Linux download page .

Installing TeamViewer on Ubuntu 26.04 #

TeamViewer is proprietary software and is not available in the standard Ubuntu repositories. Download the official package with wget :

wget https://download.teamviewer.com/download/linux/teamviewer_amd64.deb

Install the package with apt:

sudo apt install ./teamviewer_amd64.deb

When prompted, type Y and press Enter.

During installation, the TeamViewer APT repository is added to your system. This allows TeamViewer to update through the same package manager you use for other Ubuntu packages.

Starting TeamViewer #

Open the Activities overview, search for “TeamViewer”, and click the application icon.

You can also start TeamViewer from the command line:

teamviewer

The first time TeamViewer starts, accept the license agreement. After that, the main TeamViewer window displays your ID and password. Share those values only with someone you trust, or enter a remote computer’s ID to start an outgoing connection.

Updating TeamViewer #

Check the repository file with cat :

cat /etc/apt/sources.list.d/teamviewer.list

The file should contain the TeamViewer stable repository:

deb https://linux.teamviewer.com/deb stable main

Update TeamViewer with the package manager:

sudo apt update
sudo apt upgrade teamviewer

You can also install updates through Ubuntu’s graphical Software Updater.

Uninstalling TeamViewer #

To remove TeamViewer while keeping its configuration files:

sudo apt remove teamviewer

To remove TeamViewer and its configuration files:

sudo apt purge teamviewer

If you also want to remove the TeamViewer repository:

sudo rm /etc/apt/sources.list.d/teamviewer.list
sudo apt update

Troubleshooting #

teamviewer: command not found after installation
Close and reopen your terminal, then try again. If the command is still missing, verify the package installation:

dpkg -l teamviewer

The installation fails because of missing dependencies
Ask apt to repair broken dependencies and retry the package install:

sudo apt --fix-broken install
sudo apt install ./teamviewer_amd64.deb

TeamViewer shows “Not ready. Please check your connection.”
Restart the TeamViewer daemon:

sudo systemctl restart teamviewerd

Check that the service is running:

systemctl status teamviewerd

You are using an ARM system
Do not install the teamviewer_amd64.deb package on ARM. Download the ARM package from TeamViewer’s Linux download page instead.

FAQ #

Is TeamViewer free on Ubuntu?
TeamViewer is free for personal, non-commercial use. Commercial use requires a paid license.

Can I install TeamViewer Host instead?
Yes. TeamViewer Host is meant for unattended access. Download the Host package from TeamViewer’s Linux download page and install it with apt the same way.

How do I connect to another computer?
Open TeamViewer, enter the remote computer’s ID in the partner ID field, and start the connection. Enter the remote password when prompted.

Conclusion #

TeamViewer installs on Ubuntu 26.04 from the official .deb package. The package also configures the TeamViewer repository so future updates are handled through Ubuntu’s package manager.

Google Chrome is a fast web browser with built-in Google account sync, automatic updates, password management, and support for modern web applications. It is not included in the standard Ubuntu repositories because it is proprietary software.

This guide explains how to install Google Chrome on Ubuntu 26.04 using the official Google .deb package.

Quick Reference #

Installing Google Chrome on Ubuntu #

The official Chrome package installs the browser and configures the Google APT repository so future updates arrive through the normal Ubuntu update process.

Download Google Chrome #

Open a terminal and use wget to download the latest stable package:

wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb

Install Google Chrome #

Install the package with apt. This command requires sudo privileges :

sudo apt install ./google-chrome-stable_current_amd64.deb

When prompted, enter your password and confirm the installation.

Starting Google Chrome #

Open the Activities overview, search for “Google Chrome”, and launch it:

You can also start Chrome from the terminal:

google-chrome

When Chrome starts for the first time, it asks whether you want to set it as the default browser and send crash reports:

Chrome then opens the welcome page:

From here, you can sign in with your Google account and sync bookmarks, history, passwords, and extensions.

Set Chrome as Default Browser #

To set Chrome as the default browser from the command line, run:

xdg-settings set default-web-browser google-chrome.desktop

Verify the current default browser:

xdg-settings get default-web-browser

google-chrome.desktop

Updating Google Chrome #

The Chrome package adds the Google repository to your system. Check the repository file with cat :

cat /etc/apt/sources.list.d/google-chrome.list

The file should contain a Google Chrome repository entry for the stable channel.

Chrome updates are installed through the standard Ubuntu update workflow:

sudo apt update
sudo apt upgrade

Uninstalling Google Chrome #

To remove Google Chrome, run:

sudo apt remove google-chrome-stable

Remove packages that are no longer needed:

sudo apt autoremove

If you also want to remove the Google Chrome repository file, delete it and update the package index:

sudo rm /etc/apt/sources.list.d/google-chrome.list
sudo apt update

Troubleshooting #

The installation fails with dependency errors
Fix broken dependencies and repeat the installation:

sudo apt --fix-broken install
sudo apt install ./google-chrome-stable_current_amd64.deb

Chrome does not start after installation
Close any running Chrome processes and start it again:

pkill -f chrome
google-chrome

The repository file is missing
Reinstall the downloaded package so the Chrome repository is recreated:

sudo apt install ./google-chrome-stable_current_amd64.deb

FAQ #

What is the difference between Chrome and Chromium?
Chromium is the open-source browser project that Chrome is based on. Chrome adds proprietary media codecs, Google account integration, and Google-managed update packaging.

Can I install Chrome Beta or Dev on Ubuntu?
Yes. Download the Beta or Dev .deb package from Google and install it with apt in the same way as the stable package.

Does Chrome update automatically on Ubuntu?
Chrome is updated by Ubuntu’s package manager after the Google repository is added. Run sudo apt update && sudo apt upgrade to install available updates.

Conclusion #

Google Chrome installs on Ubuntu 26.04 through the official .deb package. After installation, Chrome receives updates from the Google repository along with your other system packages.

Apache is one of the most popular web servers in the world. It is an open-source and cross-platform HTTP server that powers a large percentage of the Internet’s websites. Apache provides many powerful features that can be further extended through the use of additional modules, making it a good option for those looking for a customizable and flexible web server.

This tutorial will guide you through the process of installing and managing the Apache web server on Ubuntu 26.04. You will learn how to install Apache, open HTTP and HTTPS ports in the firewall, and set up virtual hosts.

Installing Apache #

On Ubuntu and Debian systems, the Apache package and the service are called apache2.

Apache is included in the default Ubuntu repositories, and the installation is pretty straightforward.

Run the following commands to refresh the local package index and install Apache:

sudo apt update
sudo apt install apache2

After the installation process is finished, the Apache service will start automatically.

You can verify that Apache is running by typing:

sudo systemctl status apache2

The output should tell you that the service is running and enabled to start on system boot:

● apache2.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/apache2.service; enabled; preset: enabled)
Active: active (running) since Sat 2026-04-25 18:28:47 UTC; 5min ago
Invocation: d7369f2830cc4e29b4d03d6f2c0968ba
Docs: https://httpd.apache.org/docs/2.4/
Main PID: 9429 (apache2)
Status: "Total requests: 2; Idle/Busy workers 100/0;Requests/sec: 0.00608; Bytes served/>
Tasks: 7 (limit: 375)
Memory: 12.4M (peak: 12.7M)
CPU: 168ms
CGroup: /system.slice/apache2.service
├─9429 /usr/sbin/apache2 -k start -DFOREGROUND
├─9432 /usr/sbin/apache2 -k start -DFOREGROUND
├─9433 /usr/sbin/apache2 -k start -DFOREGROUND
...

Apache has been successfully installed on your Ubuntu 26.04 server. You can now start using it.

Opening HTTP and HTTPS Ports #

Apache listens on port 80 (HTTP) and 443 (HTTPS). You need to open the necessary firewall ports to allow access to the web server from the Internet.

Assuming you are using UFW , you can do that by enabling the ‘Apache Full’ profile, which includes rules for both ports:

sudo ufw allow 'Apache Full'

Verify the change:

sudo ufw status

The output should look something like this:

Status: active
To Action From
-- ------ ----
22/tcp ALLOW Anywhere
Apache Full ALLOW Anywhere
22/tcp (v6) ALLOW Anywhere (v6)
Apache Full (v6) ALLOW Anywhere (v6)

Verifying the Apache Installation #

To verify that everything works correctly, open your browser, type your server IP address http://YOUR_IP_OR_DOMAIN/, and you will see the default Ubuntu 26.04 Apache welcome page as shown below:

The page provides basic information about Apache configuration files, relevant helper scripts, and directory locations.

Setting up a Virtual Host #

A virtual host allows Apache to serve more than one website from the same server. Each virtual host defines the settings for a specific domain.

Apache ships with one default virtual host. If you are hosting a single website, you can place the site files in /var/www/html and edit /etc/apache2/sites-enabled/000-default.conf. If you want to host multiple sites, create a separate virtual host file for each domain.

In this example, we will configure a site for example.com. Replace example.com with your own domain name.

First, create the document root directory:

Run the following command to create the directory :

sudo mkdir -p /var/www/example.com

Create a simple index.html file inside the document root so you can test the configuration:

<!DOCTYPE html>
<html lang="en" dir="ltr">
 <head>
 <meta charset="utf-8">
 <title>Welcome to example.com</title>
 </head>
 <body>
 <h1>Success! example.com home page!</h1>
 </body>
</html>

Set the ownership to the Apache user:

sudo chown -R www-data:www-data /var/www/example.com

Next, create the virtual host file:

<VirtualHost *:80>
 ServerName example.com
 ServerAlias www.example.com
 ServerAdmin webmaster@example.com
 DocumentRoot /var/www/example.com

 <Directory /var/www/example.com>
 Options -Indexes +FollowSymLinks
 AllowOverride All
 Require all granted
 </Directory>

 ErrorLog ${APACHE_LOG_DIR}/example.com-error.log
 CustomLog ${APACHE_LOG_DIR}/example.com-access.log combined
</VirtualHost>

Enable the site:

sudo a2ensite example.com.conf

Test the configuration:

sudo apachectl configtest

If the syntax check passes, you will see the following output:

Syntax OK

Restart Apache:

sudo systemctl restart apache2

Now open http://example.com in your browser. If everything is configured correctly, you should see the test page.

Conclusion #

We have shown you how to install Apache on Ubuntu 26.04, open the required firewall ports, and configure a virtual host. From here, you can deploy your site content or continue with SSL and PHP setup.

Java is a popular programming language used for building applications and software solutions. It runs on all major operating systems and devices.

This guide covers installing OpenJDK and Oracle JDK on Ubuntu 26.04.

Quick Reference #

Before You Begin #

There are several Java implementations available. OpenJDK and Oracle JDK are the two most common choices. OpenJDK is the default option in Ubuntu and the best fit for most systems.

Ubuntu 26.04 includes OpenJDK packages for both the Java Runtime Environment (JRE) and the Java Development Kit (JDK). The JRE includes the Java virtual machine (JVM) and the libraries needed to run Java programs. The JDK includes the JRE plus the tools needed to build Java applications.

If you are not sure which package to install, start with the default OpenJDK version. Some applications require a specific Java release, so check the application documentation before you install it.

Installing OpenJDK in Ubuntu #

Check if Java is already installed:

java -version

If Java is not installed, the output will tell you the command is not found. Otherwise, it shows the installed version.

Update the package index:

sudo apt update

The current long-term supported (LTS) versions of Java are: 11, 17, 21, and 25. The default Java in Ubuntu 26.04 is Java 25, which you get by installing the default-jdk package.

Install latest LTS Java 25:

sudo apt install openjdk-25-jdk

Verify the installation:

java -version

openjdk version "25.0.3-ea" 2026-04-21
OpenJDK Runtime Environment (build 25.0.3-ea+7-Ubuntu-2)
OpenJDK 64-Bit Server VM (build 25.0.3-ea+7-Ubuntu-2, mixed mode, sharing)

JRE is included in the JDK package. If you need only JRE, install the openjdk-25-jre package. For minimal Java runtime, install the openjdk-**25**-jre-headless package.

Installing Oracle Java in Ubuntu #

Oracle JDK is not available in the default Ubuntu repositories. You can install it by downloading the .deb package from Oracle.

At the time of writing, Oracle’s downloads page offers both JDK 26, the latest feature release, and JDK 25, the latest LTS release. Oracle JDK 25 is available under Oracle No-Fee Terms and Conditions (NFTC), which allows free production use and redistribution for that release. If you plan to standardize on Oracle JDK, review Oracle’s current licensing terms before deployment.

Visit the Oracle Java Downloads page and select the version you need.

In this example, we will download and install Java 25 because it is the current LTS release. If you want the newest feature release instead, download JDK 26 from the same page. Choose the Linux x64 Debian Package for the version you want and download the .deb file.

If you are installing on a server, use wget to download the file:

wget https://download.oracle.com/java/25/latest/jdk-25_linux-x64_bin.deb

Install the package:

sudo apt install ./jdk-25_linux-x64_bin.deb

Replace the filename if you downloaded a different version.

Setting the Default Java Version #

If you have multiple Java versions installed, check the current default:

java -version

Change the default version with update-alternatives:

sudo update-alternatives --config java

You will see a list of installed Java versions:

There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/jdk-25.0.3-oracle-x64/bin/java 419454976 auto mode
1 /usr/lib/jvm/java-25-openjdk-amd64/bin/java 2511 manual mode
2 /usr/lib/jvm/jdk-25.0.3-oracle-x64/bin/java 419454976 manual mode
Press <enter> to keep the current choice[*], or type selection number: 

Enter the number of the version you want as default and press Enter.

Verify the change:

java -version

Setting the JAVA_HOME Environment Variable #

Some Java applications use the JAVA_HOME environment variable to determine the JDK location.

First, find the Java installation path:

sudo update-alternatives --config java

The paths are:

• Oracle JDK 25 is located at /usr/lib/jvm/jdk-25-oracle-x64/bin/java
• OpenJDK 25 is located at /usr/lib/jvm/java-25-openjdk-amd64/bin/java

Open the /etc/environment file:

sudo nano /etc/environment

Add the following line (adjust the path for your preferred version):

JAVA_HOME="/usr/lib/jvm/java-25-openjdk-amd64"

Apply the changes:

source /etc/environment

Verify the variable is set:

echo $JAVA_HOME

/usr/lib/jvm/java-25-openjdk-amd64

Uninstalling Java #

Uninstall Java like any other package:

sudo apt remove openjdk-25-jdk

Replace the package name with the version you want to remove.

Conclusion #

We covered installing OpenJDK from the Ubuntu 26.04 repositories and downloading Oracle JDK manually. The default OpenJDK 25 works for most applications, but Java 26 is also available in the Oracle repositories for the latest features.

For more information, see the official OpenJDK documentation .

PHP is one of the most used server-side programming languages. Many popular CMS and frameworks such as WordPress, Magento, and Laravel are written in PHP.

This guide covers the steps necessary to install PHP on Ubuntu 26.04 and integrate it with Nginx and Apache. The default Ubuntu 26.04 repositories include PHP 8.5. We will also show you how to install other PHP versions.

Quick Reference #

Prerequisites #

To follow this guide, you need to be logged in as a user with sudo privileges .

Installing PHP 8.5 with Apache #

If you are using Apache as your web server, run the following commands to install PHP and the Apache PHP module:

sudo apt update
sudo apt install php libapache2-mod-php

Once the packages are installed, restart Apache for the PHP module to get loaded:

sudo systemctl restart apache2

Installing PHP 8.5 with Nginx #

Unlike Apache, Nginx does not have built-in support for processing PHP files. We will use PHP-FPM (FastCGI Process Manager) to handle PHP files.

Run the following commands to install PHP and the PHP-FPM package:

sudo apt update
sudo apt install php-fpm

If apt cannot locate php-fpm, make sure the Universe repository is enabled. Standard Ubuntu installations usually include it, but minimal images may have only the core repository components enabled:

sudo apt install software-properties-common
sudo add-apt-repository universe
sudo apt update
sudo apt install php-fpm

Once the installation is completed, the FPM service starts automatically. To check the status of the service, run:

sudo systemctl status php8.5-fpm

● php8.5-fpm.service - The PHP 8.5 FastCGI Process Manager
Loaded: loaded (/usr/lib/systemd/system/php8.5-fpm.service; enabled; preset: enabled)
Active: active (running) since Sat 2026-04-26 09:15:22 UTC; 12s ago

You can now edit the Nginx server block and add the following lines so that Nginx can process PHP files:

server {

 # . . . other code

 location ~ \.php$ {
 include snippets/fastcgi-php.conf;
 fastcgi_pass unix:/run/php/php-fpm.sock;
 }
}

The /run/php/php-fpm.sock path is managed through alternatives on Ubuntu. If that symlink does not exist, list the available sockets and use the versioned PHP-FPM socket shown by your system:

ls -l /run/php/

Restart the Nginx service so that the new configuration takes effect:

sudo systemctl restart nginx

Installing PHP Extensions #

PHP extensions are compiled libraries that extend the core functionality of PHP. Extensions are available as packages and can be easily installed with apt :

sudo apt install php-[extname]

For example, to install the MySQL and GD extensions, run:

sudo apt install php-mysql php-gd

Here are some of the most commonly used PHP extensions:

To install all commonly needed extensions at once:

sudo apt install php-mysql php-curl php-gd php-mbstring php-xml php-zip php-intl php-opcache php-bcmath

After installing a new PHP extension, restart Apache or PHP-FPM depending on your setup:

sudo systemctl restart apache2

Or for Nginx with PHP-FPM:

sudo systemctl restart php8.5-fpm

To list all installed PHP modules:

php -m

Testing PHP Processing #

To confirm that the web server can process PHP files, create a new info.php file in /var/www/html:

echo '<?php phpinfo();' | sudo tee /var/www/html/info.php

Open http://your_server_ip/info.php in your browser. If PHP is configured correctly, you will see the PHP information page:

sudo rm /var/www/html/info.php

Installing Other PHP Versions #

Ondřej Surý, a Debian developer, maintains a repository that includes multiple PHP versions. This is a third-party source, so use it only if you need a different PHP version than what Ubuntu provides. To enable the repository , run:

sudo apt install software-properties-common
sudo add-apt-repository ppa:ondrej/php

You can now install any PHP version you need by appending the version number to the package name:

sudo apt install php[version]

For example, to install PHP 8.3 and a few common modules:

sudo apt install php8.3 php8.3-cli php8.3-common php8.3-opcache php8.3-gd php8.3-curl php8.3-mysql php8.3-mbstring php8.3-xml

Switching Between PHP Versions #

If you have multiple PHP versions installed, you can switch the default CLI version using update-alternatives:

sudo update-alternatives --set php /usr/bin/php8.3

To interactively choose the default version:

sudo update-alternatives --config php

For Apache, disable the current PHP module and enable the one you want:

sudo a2dismod php8.5
sudo a2enmod php8.3
sudo systemctl restart apache2

For Nginx, update the PHP-FPM socket path in your server block to point to the correct version, then restart Nginx:

sudo systemctl restart nginx

Checking the PHP Version #

To check which PHP version is installed on your system, run:

php -v

PHP 8.5.4 (cli) (built: Apr 1 2026 09:36:11) (NTS)
Copyright (c) The PHP Group
Built by Ubuntu
Zend Engine v4.5.4, Copyright (c) Zend Technologies
with Zend OPcache v8.5.4, Copyright (c), by Zend Technologies

PHP Configuration Files #

PHP configuration files are located at:

• Main config: /etc/php/8.5/cli/php.ini (CLI) and /etc/php/8.5/apache2/php.ini (Apache) or /etc/php/8.5/fpm/php.ini (FPM)
• FPM pool config: /etc/php/8.5/fpm/pool.d/www.conf
• Extension configs: /etc/php/8.5/mods-available/

After changing any configuration, restart the relevant service:

sudo systemctl restart php8.5-fpm

Uninstalling PHP #

To remove PHP and related packages, you can purge them and clean up dependencies:

sudo apt purge 'php*'
sudo apt autoremove

FAQ #

What PHP version does Ubuntu 26.04 include?
Ubuntu 26.04 ships with PHP 8.5 in its default repositories.

What is the difference between php and php-fpm?
The php package includes the CLI interpreter and the Apache module. The php-fpm package provides a FastCGI Process Manager used by Nginx and other web servers that do not have built-in PHP support.

Can I run multiple PHP versions at the same time?
Yes. You can install multiple PHP versions from the Ondřej Surý PPA and configure each virtual host or server block to use a different PHP version.

Do I need to restart Apache or Nginx after installing an extension?
Yes. After installing a PHP extension, restart Apache (sudo systemctl restart apache2) or PHP-FPM (sudo systemctl restart php8.5-fpm) for the extension to be loaded.

Where is the php.ini file located?
PHP uses separate php.ini files for each SAPI. The CLI config is at /etc/php/8.5/cli/php.ini, the Apache config at /etc/php/8.5/apache2/php.ini, and the FPM config at /etc/php/8.5/fpm/php.ini.

Conclusion #

We have shown you how to install PHP 8.5 on Ubuntu 26.04 with both Apache and Nginx. You can now install extensions, configure PHP, and start building your applications.

If you have any questions, feel free to leave a comment below.

Nginx (pronounced “engine x”) is an open-source, high-performance HTTP and reverse proxy server used by some of the largest sites on the Internet. It can act as a standalone web server, load balancer, content cache, and proxy for HTTP and non-HTTP services.

This guide explains how to install Nginx on Ubuntu 26.04, configure the firewall, and manage the service.

Prerequisites #

Before continuing, make sure you are logged in as a user with sudo privileges , and that no other service such as Apache is running on port 80 or 443.

Installing Nginx #

Nginx is available in the default Ubuntu repositories. To install it, run:

sudo apt update
sudo apt install nginx

Once the installation is completed, the Nginx service starts automatically. To verify it is running:

sudo systemctl status nginx

● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; preset: enabled)
Active: active (running) since Fri 2026-04-25 15:00:00 UTC; 10s ago
...

Nginx is now installed and running. You can manage the Nginx service in the same way as any other systemd unit.

Configuring the Firewall #

Now that Nginx is running, you need to make sure the firewall allows traffic on HTTP (80) and HTTPS (443). If you are using ufw , enable the Nginx Full profile which covers both ports:

sudo ufw allow 'Nginx Full'

To verify the firewall status:

sudo ufw status

Status: active
To Action From
-- ------ ----
22/tcp ALLOW Anywhere
Nginx Full ALLOW Anywhere
22/tcp (v6) ALLOW Anywhere (v6)
Nginx Full (v6) ALLOW Anywhere (v6)

Testing the Installation #

To confirm Nginx is serving requests, open http://YOUR_IP in a browser. You should see the default Nginx welcome page. You can also test from the command line:

curl -I http://localhost

HTTP/1.1 200 OK
Server: nginx/1.28.3 (Ubuntu)
...

Nginx Configuration Structure #

• All Nginx configuration files are located in /etc/nginx/.
• The main configuration file is /etc/nginx/nginx.conf.
• Create a separate configuration file for each domain to keep things manageable. Server block files are stored in /etc/nginx/sites-available/ and must be symlinked to /etc/nginx/sites-enabled/ to be active.
• Follow the standard naming convention: if your domain is mydomain.com, name the file /etc/nginx/sites-available/mydomain.com.conf.
• The /etc/nginx/snippets/ directory holds reusable configuration fragments that can be included in server block files.
• Log files (access.log and error.log) are located in /var/log/nginx/. Use a separate log file per server block.
• Common document root locations: /var/www/<site_name>, /var/www/html/<site_name>, or /home/<user>/<site_name>.

Conclusion #

Nginx is now installed and ready to serve your applications on Ubuntu 26.04. To set up multiple sites on the same server, see the guide on Nginx server blocks .

PostgreSQL is an open-source, object-relational database management system known for its reliability, feature set, and standards compliance. It is widely used in production environments ranging from small applications to large-scale data warehouses.

This guide explains how to install PostgreSQL 18 on Ubuntu 26.04, set up roles and authentication, and configure remote access.

Prerequisites #

To follow this guide, you need to be logged in as a user with sudo privileges .

Installing PostgreSQL on Ubuntu 26.04 #

The default Ubuntu 26.04 repositories include PostgreSQL 18.

Start by updating the local package index:

sudo apt update

Install the PostgreSQL server and the contrib package, which provides several additional features:

sudo apt install postgresql postgresql-contrib

Once the installation is completed, the PostgreSQL service starts automatically. Use the psql tool to verify the installation by connecting to the PostgreSQL server and printing its version :

sudo -u postgres psql -c "SELECT version();"

 version
----------------------------------------------------------------------------------------------------------------------------------
PostgreSQL 18.3 (Ubuntu 18.3-1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 15.2.0-14ubuntu1) 15.2.0, 64-bit
(1 row)

PostgreSQL has been installed and is ready to use.

PostgreSQL Roles and Authentication #

Database access in PostgreSQL is managed through roles. A role can represent a database user or a group of database users.

PostgreSQL supports several authentication methods . The most commonly used are:

• Trust lets a role connect without a password, as long as the conditions in pg_hba.conf are met.
• Password lets a role connect by providing a password. Passwords can be stored as scram-sha-256 or md5.
• Ident is supported on TCP/IP connections. It obtains the client’s operating system username, with optional mapping.
• Peer works like Ident, but for local connections only.

PostgreSQL client authentication is defined in pg_hba.conf. By default, PostgreSQL uses the peer authentication method for local connections.

The postgres user is created automatically during installation. It is the superuser for the PostgreSQL instance, equivalent to the MySQL root user.

To log in to the PostgreSQL server as the postgres user, use the sudo command:

sudo -u postgres psql

You can also switch to the user first:

sudo su - postgres
psql

To exit the PostgreSQL shell, type:

\q

Creating a Role and Database #

Only superusers and roles with the CREATEROLE privilege can create new roles.

The following example creates a role named john, sets a password for the role, and creates a database named johndb owned by that role:

1. Create a new PostgreSQL role:

   Terminal

   sudo -u postgres createuser john

2. Set a password for the role:

   Terminal

   sudo -u postgres psql

   sql

   ALTER ROLE john WITH ENCRYPTED PASSWORD 'strong_password';

   Use a real password here. Do not store it in shell history, scripts, or version control.

3. Create a new database owned by that role:

   Terminal

   sudo -u postgres createdb johndb --owner=john

Because john owns the database, it can create objects in the default public schema without additional grants.

Enabling Remote Access #

By default, PostgreSQL only listens on localhost (127.0.0.1).

To allow remote connections, open the PostgreSQL configuration file:

sudo nano /etc/postgresql/18/main/postgresql.conf

Find the listen_addresses line in the CONNECTIONS AND AUTHENTICATION section and set it to '*' to listen on all interfaces:

listen_addresses = '*'

Save the file and restart the PostgreSQL service:

sudo systemctl restart postgresql

Verify that PostgreSQL is now listening on all interfaces:

ss -nlt | grep 5432

LISTEN 0 244 0.0.0.0:5432 0.0.0.0:*
LISTEN 0 244 [::]:5432 [::]:*

The next step is to configure which hosts are allowed to connect by editing pg_hba.conf:

sudo nano /etc/postgresql/18/main/pg_hba.conf

Add rules at the bottom of the file. Some examples:

# TYPE DATABASE USER ADDRESS METHOD
# Allow jane to connect to all databases from anywhere using a password
host all jane 0.0.0.0/0 scram-sha-256
# Allow jane to connect only to janedb from anywhere
host janedb jane 0.0.0.0/0 scram-sha-256
# Allow jane to connect from a trusted host without a password
host all jane 192.168.1.134 trust

Reload PostgreSQL to apply the changes:

sudo systemctl reload postgresql

Finally, open port 5432 in the firewall. To allow access from a specific subnet:

sudo ufw allow proto tcp from 192.168.1.0/24 to any port 5432

Conclusion #

We have shown you how to install PostgreSQL 18 on Ubuntu 26.04 and covered the basics of roles, authentication, and remote access. For more details, consult the PostgreSQL 18 documentation .