apt-get install pkg_name[-]
suffix with - to remove
apt-get upgrade
upgrades all packages
will "keep back" packages in case of broken dependencies (absent
dependencies), or if a package has an additional dependency
(resolve with apt-get install)
apt-get dist-upgrade
upgrades everything, handling relationship changes
apt-get clean; apt-get autoclean
remove cached packages under varying conditions
/etc/apt/apt.conf
config file
contains APT::Default-Release "version";
/etc/apt/preferences
allows pinning of packages
pin priorities allow packages to be blocked from installation,
or from being upgraded, plus intermediate behaviours