# official debian repository: deb http://ftp.debian.org/debian/ stable main contrib non-free-firmware non-free deb-src http://ftp.debian.org/debian/ stable main contrib non-free-firmware non-free # security updates: deb http://security.debian.org/debian-security stable-security main contrib non-free-firmware non-free deb-src http://security.debian.org/debian-security stable-security main contrib non-free-firmware non-free # backports: deb http://ftp.debian.org/debian/ stable-backports main contrib non-free-firmware non-free deb-src http://ftp.debian.org/debian/ stable-backports main contrib non-free-firmware non-free