How to check installed packages?

To check the installed packages on a Debian-based system, you can use the following command in the terminal:

dpkg --get-selections

This will list all installed packages. If you want to filter the output to show only installed packages, you can use:

dpkg --get-selections | grep -v deinstall

Alternatively, you can also use:

apt list --installed

This command will provide a list of all installed packages along with their versions.