z.B. für network-manager von launchpad ( https://launchpad.net/~network-manager/+archive/ppa )

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 8B6C49916FD28CBDFC5DA3A2248DD1EEBC8EBFE8

z.B. für Wine repository

wget -O - http://www.lamaresh.net/apt/key.gpg | apt-key add -

In Paketbeschreibungen nach etwas suchen:

apt-cache search bla

In den Dateinamen von Dateien, die ein Paket zur Verfügung stellt, suchen: (vorher apt-file installieren und apt-file update)

apt-file search bla

http://forum.skype.com/index.php?showtopic=29679

deb http://download.skype.com/linux/repos/debian/ stable non-free

http://debian-multimedia.org/

deb http://ftp.uni-kl.de/debian-multimedia/ lenny main
deb-src http://ftp.uni-kl.de/debian-multimedia/ lenny main

http://www.winehq.org/download/deblenny

Open a terminal
su #to log as root
gedit /etc/apt/sources.list #to open repository file with a text editor (you can use gedit or another)
Add this line for Lenny: deb http://www.lamaresh.net/apt lenny main
Add this line for Squeeze: deb http://www.lamaresh.net/apt squeeze main
Add this line for Sid: deb http://www.lamaresh.net/apt sid main
Save and close sources.list
wget -O - http://www.lamaresh.net/apt/key.gpg | apt-key add - #to add gpg key
apt-get update #to update package list
apt-get install wine #to install latest wine version

–> nicht so empfehlenswert

http://www.debian.org/volatile/

deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free

für die proposed updates:

deb http://volatile.debian.org/debian-volatile lenny-proposed-updates/volatile main

deb http://ftp.de.debian.org/backports.org/ lenny-backports main contrib non-free

apt-get install debian-backports-keyring

deb http://download.virtualbox.org/virtualbox/debian lenny non-free

wget -q http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc -O- | apt-key add -
apt-get install virtualbox-3.0

http://www.virtualbox.org/wiki/Linux_Downloads