--- /dev/null
+deb http://deb.debian.org/debian bullseye main contrib non-free
+deb http://deb.debian.org/debian-security/ bullseye/updates main contrib non-free
+deb http://deb.debian.org/debian bullseye-updates main contrib non-free
+deb http://ftp.debian.org/debian bullseye-backports main contrib non-free