Apt sources.list

 #/etc/apt/sources.list 

 # CDROM / DVD
# deb cdrom:[Debian GNU/Linux 12.0.0 _Buster_ - Official amd64 DVD Binary-1 2023xxxx-xx:xx]/ buster contrib main

Debian Apt downloads packages

DEBIAN BUSTER MAIN

deb http://deb.debian.org/debian buster main
deb-src http://deb.debian.org/debian buster main

deb http://deb.debian.org/debian-security/ buster/updates main
deb-src http://deb.debian.org/debian-security/ buster/updates main

deb http://deb.debian.org/debian buster-updates main
deb-src http://deb.debian.org/debian buster-updates main

DEBIAN BUSTER NON FREE

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

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

DEBIAN BUSTER BACKPORTS

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

DEBIAN BUSTER THIRD-PARTY

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

deb https://deb.torproject.org/torproject.org stretch main
deb-src https://deb.torproject.org/torproject.org stretch main

deb http://deb.opera.com/opera-stable/ stable non-free
deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main