Apt
From DWIKI
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
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
