deb http://deb.debian.org/debian/ bookworm-backports main non-free-firmware contrib
deb-src http://deb.debian.org/debian/ bookworm main non-free-firmware contrib

deb http://security.debian.org/debian-security bookworm-security main non-free-firmware contrib
deb-src http://security.debian.org/debian-security bookworm-security main non-free-firmware contrib

deb http://deb.debian.org/debian/ bookworm-updates main non-free-firmware contrib
deb-src http://deb.debian.org/debian/ bookworm-updates main non-free-firmware contrib

# VirtualBox
deb [arch=amd64 signed-by=/usr/share/keyrings/oracle-virtualbox-2016.gpg] https://download.virtualbox.org/virtualbox/debian bookworm contrib