These are the commands that I mostly use to manage packages from the CLI. See
man command for more detailed help.
apt-cache search text to search for packages containing the specified text. Listed packages can be installed using
apt-get. To see details about a package use
apt-cache showpkg packages.
apt-add-repository url to add a new repository source
apt-add-repository -r url to remove
sudo apt-get install package_name to install or upgrade a package
sudo apt-get update to update package cache from active respository sources, usually after a
dpkg -l to list all packages installed and their versions. pipe to
grep to filter.
sudo dpkg -i deb_package to install from a package archive
dpkg -S file to discover which package a file belongs to
sudo dpkg -r --force-depends to forcefully remove a broken package e.g.
sudo dpkg -r --force-depends libssl1.0.0