Table of Contents
/etc/apt/sources.list
contains the links to the packet sources
sudo dpkg-query -l to see what packages are installed
sudo dpkg-query -l | grep <packagename>
for a specific package
sudo apt-get install mc to install midnight commander
sudo apt search <packagename>
to see what package can be installed
remove sudo apt-get remove --auto-remove <packagename>
and sudo apt-get purge <packagename>
and sudo reboot.
apt-show-versions -a <packetname>
shows versions available, installed apt-show-versions might have to be installed first