Pondré acá la configuración de mi Debian Lenny y que les puede servir 
deb http://ftp.cica.es/debian/ lenny main contrib non-free #deb-src http://ftp.cica.es/debian/ lenny main contrib non-free deb http://security.debian.org/ lenny/updates main #deb-src http://security.debian.org/ lenny/updates main deb http://volatile.debian.org/debian-volatile lenny/volatile main #deb-src http://volatile.debian.org/debian-volatile lenny/volatile main #Repositorios oficiales de Debian deb http://mmc.geofisica.unam.mx/debian/ lenny main deb http://ftp.mx.debian.org/debian/ lenny main deb http://ftp.debian.org/debian/ lenny main non-free contrib deb http://ftp.de.debian.org/debian/ lenny main contrib non-free deb http://ftp.rediris.es/debian lenny main contrib non-free deb http://ftp.br.debian.org/debian/ lenny main contrib non-free #Backports #deb http://www.backports.org/debian lenny-backports main contrib non-free #Debian Multimedia #deb http://www.debian-multimedia.org squeeze main non-free deb http://www.debian-multimedia.org lenny main non-free # Google testing repository #deb http://dl.google.com/linux/deb/ testing non-free #Opera for Debian Squeeze deb http://deb.opera.com/opera testing non-free # Skype deb http://download.skype.com/linux/repos/debian/ stable non-free ## Thí¨mes du projet bisigi deb http://ppa.launchpad.net/bisigi/ppa/ubuntu jaunty main
Antes de que realicen el aptitude update deben de realizar lo siguiente:
wget http://www.debian-multimedia.org/pool/main/d/debian-multimedia-keyring/debian-multimedia-keyring_2008.10.16_all.deb dpkg -i /home/hbautista/debian-multimedia-keyring_2008.10.16_all.deb gpg --keyserver hkp://keyserver.ubuntu.com:11371 --recv-key 881574DE && gpg -a --export 881574DE | apt-key add - gpg --keyserver subkeys.pgp.net --recv-key 6A423791 && gpg --fingerprint 6A423791 && gpg --armor --export 6A423791| apt-key add - wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - aptitude update aptitude install debian-backports-keyring
Y con eso tendrán para poder usar dichos repositorios
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