APT

Fun fact

.deb packages are just ar files with a funky header (d.e.b) and some pre/post scripts. Ar files are also .o files after compilation but before linking, what!?! Also, tar is based on Ar, WHAT!?! Elf files, the whole thing is standardized!!

Automatic updates and upgrades

Full explanation here: Debian Wiki

Run as root:

apt-get install unattended-upgrades apt-listchanges
echo unattended-upgrades unattended-upgrades/enable_auto_updates boolean true | debconf-set-selections
dpkg-reconfigure -f noninteractive unattended-upgrades

Wait for apt-get to be available

while ! apt-get -qq check; do sleep 1s; done

Enable automatic upgrades with cli

apt install unattended-upgrades && dpkg-reconfigure -plow unattended-upgrades

Enable automatic upgrades with config

• /etc/apt/apt.conf.d/20auto-upgrades should contain 2 lines

APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

• configure with /etc/apt/apt.conf.d/50unattended-upgrades … something

Purge uninstalled packages on Ubuntu

dpkg --list |grep "^rc" | cut -d " " -f 3 | xargs sudo dpkg --purge

Sort installed Debian packages by size

dpkg-query -W --showformat='${Installed-Size} ${Package}\n' | sort -n