deb http://deb.debian.org/debian/ buster main contrib non-free
#deb-src http://deb.debian.org/debian/ buster main contrib non-free
#deb http://security.debian.org/ buster/updates main contrib non-free
#deb-src http://security.debian.org/ buster/updates main contrib non-free
#deb http://deb.debian.org/debian buster-backports main contrib non-free
#deb-src http://deb.debian.org/debian buster-backports main contrib non-free