eronis@Linuxbox:~$ cat /etc/apt/sources.list
#
# deb cdrom:[Debian GNU/Linux 10.9.0 _Buster_ - Official amd64 NETINST 20210327-10:38]/ bullseye main
# deb cdrom:[Debian GNU/Linux 10.9.0 _Buster_ - Official amd64 NETINST 20210327-10:38]/ bullseye main
deb http://deb.debian.org/debian/ bullseye main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye main contrib non-free
deb http://security.debian.org/debian-security bullseye-security main contrib non-free
deb-src http://security.debian.org/debian-security bullseye-security main contrib non-free
# bullseye-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ bullseye-updates main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye-updates main contrib non-free
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
eronis@Linuxbox:~$