How do I see what packages are installed on Ubuntu Linux?

You can use the dpkg command to see what packages are installed on Ubuntu Linux. The following command will list all installed packages:

dpkg --list

This will display a list of all packages installed on the system, including their names, versions, and descriptions.

Another way to see installed packages is to use the apt command:

apt list --installed

This will show a list of all packages installed on the system and their versions. You can use the grep command to filter the output for specific packages:

apt list --installed | grep <package-name>

Replace <package-name> with the name of the package you want to search for.