Metti solo queste nel sources.list

deb ftp://ftp2.fr.debian.org/debian/ unstable main non-free contrib
deb-src ftp://ftp2.fr.debian.org/debian/ unstable main non-free contrib
deb ftp://ftp.nerim.net/debian-marillat/ unstable main

Poi dai

apt-get update
apt-get dist-upgrade