To get a list of all installed packages on a Debian or Ubuntu server, run the command:

dpkg --get-selections

This command will show you a rather long list. To save the list to a file, use this command:

dpkg --get-selections > /tmp/packages.txt

the list is saved then in the file /tmp/packages.txt.

If you seek for a specific package, use the grep command:

dpkg --get-selections | grep nginx

will show you all packages that contain the word "Nginx" in their name.

Example:

root@sv1:/# dpkg --get-selections | grep nginx
nginx-common                                    install
nginx-extras                                    install

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