deb-src http://ftp.de.debian.org./debian bookworm main contrib non-free-firmware deb-src http://ftp.de.debian.org./debian bookworm-updates main contrib non-free-firmware deb-src http://ftp.de.debian.org./debian bookworm-proposed-updates main contrib non-free-firmware deb-src http://security.debian.org./debian-security bookworm-security main contrib non-free-firmware deb-src http://ftp.de.debian.org./debian bookworm-backports main contrib non-free-firmware