deb http://ftp.nl.debian.org/debian/ buster main non-free contrib#deb http://security.debian.org/debian-security buster/updates main contrib non-free#deb http://ftp.nl.debian.org/debian/ buster-backports main non-free contribdeb http://ftp.nl.debian.org/debian/ unstable main non-free contribdeb http://ftp.nl.debian.org/debian/ stretch main non-free contribdeb http://ftp.nl.debian.org/debian/ jessie main non-free contrib