On Sat, Jun 06, 2020 at 06:08:48PM +0300, Andrei POPESCU wrote: > As per the description, gdebi is for local (i.e. downloaded .deb files) > so it provides a function that synaptic does not.
For the record, gdebi is basically obsolete these days. Its main feature ("install a local .deb plus all of its dependencies") has been incorporated into apt-get and apt. apt install ./some-local-file.deb Don't forget the leading ./ characters. They are required so that apt knows this is a pathname rather than a packagename. You're also allowed to specify a pathname with leading / or leading ../ characters.