Apt

Debian/Ubuntu package manager

 

FAQ

Show version of packages before installing

apt-get -s install somepackage

or

apt install madison-lite
apt-cache madison somepackage

have been kept back

Usually means you should run dist-upgrade

 

Unable to correct problems, you have held broken packages.

Try

dpkg --get-selections | grep hold

What packages depend on package

apt-cache rdepends --installed libc6-dev

Clear cache

apt-get clean

Could not handshake: The TLS connection was non-properly terminated.

try http instead of https

Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead

fart a lot