Voilà la liste dans sources.list :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
deb [arch=amd64]
http://download.virtualbox.org/virtualbox/debian buster contrib
## Add this line for Opera browser
## use "stable" instead of distribution name
deb
http://deb.opera.com/opera-stable/ stable non-free
# Backports repository
#deb
http://deb.debian.org/debian buster-backports main contrib non-free # disponible après la publication de buster
#deb
http://deb.debian.org/debian buster-backports-sloppy main contrib non-free # disponible après la publication de bullseye
# Debian Buster, dépôt de rétroportages ("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
Et dans /etc/apt/sources.list.d/opera-stable.list :# This file makes sure that Opera Browser is kept up-to-date
# as part of regular system upgrades
deb
https://deb.opera.com/opera-stable/ stable non-free #Opera Browser (final releases)