To list all non-free Linux packages that are installed on your Linux Mint system, use this one-liner. This prints out a list of all non-free packages that are installed on a system. [email protected] ~ $ dpkg-query -W -f ‘${Section}/${Package}\n’ | grep -E ‘^(contrib|multiverse|non-free|partner|restricted)/’ | sort contrib/kernel/virtualbox-guest-dkms contrib/misc/virtualbox-guest-utils contrib/x11/[email protected] ~ $ dpkg-query -W -f ‘${Section}/${Package}\n’ | …