Apt#

Maintenance#

apt update
apt upgrade
apt dist-upgrade or apt full-upgrade
apt autoremove
systemctl reload postfix
shutdown -r now

Restart note: Netcup SCP > Server > Steuerung > Garantierter Neustart

You can replace apt-get with aptitude

Source package list under

/etc/apt/sources.list
/etc/apt/sources.list.d

example: /usr/share/doc/apt/examples/sources.list

# See sources.list(5) for more information, especialy
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.
deb http://http.us.debian.org/debian stable main contrib non-free
deb http://security.debian.org stable/updates main contrib non-free

# Uncomment if you want the apt-get source function to work
#deb-src http://http.us.debian.org/debian stable main contrib non-free
#deb-src http://security.debian.org stable/updates main contrib non-free

deb http://debian-multimedia.org stable main

Backports packages

deb http://archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-backports main restricted universe multiverse

Seach

apt-cache search <package>

Update package list

apt-get clean
apt-get update

Update all installed packages:

aptitude dist-upgrade
apt-get dist-upgrade

Deinstall

apt-get remove <package>
apt-get autoremove openjdk-6-jdk

Check installed packages:
http://www.cyberciti.biz/tips/linux-debian-package-management-cheat-sheet.html

dpkg -l
dpkg -l '*apache*'