Debian APT

Check for unused packages

dpkg -l | awk '/^rc/ { print $2 }'

apt-get purge xxx

apt-mark hold smartmontools

ALL in one go;

apt-get purge $(dpkg -l | awk '/^rc/ { print $2 }')

dpkg --get-selections | grep 'hold$'

apt-mark unhold openssh-server
apt-mark unhold net-tools
apt-mark unhold bridge-utils