deborphan
Display orphan packages on operating systems using the APT package manager.
TLDR
Display library packages (from the "libs" section of the package repository) which are not required by another package
$ deborphan
List orphan packages from the "libs" section as well as orphan packages that have a name that looks like a library name
$ deborphan --guess-all
Find packages which are only recommended or suggested (but not required) by another package
$ deborphan --nice-mode
