deb http://ftp.ru.debian.org/debian/ squeeze main contrib non-free deb http://security.debian.org/ squeeze/updates main contrib non-free deb http://ftp.ru.debian.org/debian/ squeeze-updates main contrib non-free deb http://backports.debian.org/debian-backports squeeze-backports main contrib non-free Не забывайте apt-get update после внесения изменений в sources.list