How to check packages list in ubuntu

To check the list of installed packages on Ubuntu, you can use several methods. Here are the most common ones:

1. Using dpkg Command

The dpkg command can list all installed packages:

dpkg --get-selections

This will display a list of all installed packages along with their installation status.

2. Using apt Command

The apt command provides a more human-readable output:

apt list --installed

This will show a list of installed packages along with their versions.

3. Using dpkg-query Command

You can also use dpkg-query for more detailed output:

dpkg-query -l

This will display the list of installed packages with additional information like package name, version, and a brief description.

4. Search for a Specific Package

If you're looking for a specific package to see if it's installed, you can use:

dpkg -l | grep package_name

Replace package_name with the name of the package you're searching for.

5. List Packages by Size

To list installed packages sorted by size:

dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n

This will sort packages by their installed size in ascending order.

6. Using synaptic Package Manager (GUI method)

If you prefer a graphical interface, you can install and use Synaptic Package Manager:

sudo apt install synaptic

Once installed, you can open Synaptic and view, search, or filter installed packages.

7. Generate a List of Installed Packages

To generate a list of installed packages and save it to a file:

dpkg --get-selections > installed_packages.txt

This will create a file called installed_packages.txt with a list of all installed packages.

These methods should help you check and manage the installed packages on your Ubuntu system.