demo@mx1:/etc/apt/sources.list.d
$ ls
antix.list  debian.list  debian-stable-updates.list  mx.list  various.list
demo@mx1:/etc/apt/sources.list.d
$ cat antix.list
# Use with Debian Stable/buster repositories.
deb http://iso.mxrepo.com/antix/buster buster main
#deb-src http://iso.mxrepo.com/antix/buster buster main
demo@mx1:/etc/apt/sources.list.d
$ cat debian.list
# Debian Stable.
deb http://deb.debian.org/debian buster main contrib non-free
deb http://deb.debian.org/debian-security buster/updates main contrib non-free
#deb-src http://deb.debian.org/debian buster main contrib non-free

#stretch backports
#deb http://deb.debian.org/debian buster-backports main contrib non-free
demo@mx1:/etc/apt/sources.list.d
$ cat debian-stable-updates.list
# Debian stretch Updates
deb http://deb.debian.org/debian buster-updates main contrib non-free
demo@mx1:/etc/apt/sources.list.d
$ cat mx.list
# MX Community Main and Test Repos
deb http://mxrepo.com/mx/repo/ buster main non-free
#deb http://mxrepo.com/mx/testrepo/ buster test
demo@mx1:/etc/apt/sources.list.d
$ cat various.list
# opera
#deb http://deb.opera.com/opera/ stable non-free

# virtualbox
#deb http://download.virtualbox.org/virtualbox/debian buster contrib


demo@mx1:/etc/apt/sources.list.d
$