==== bullseye ====
My /etc/apt/sources.list for bullseye

<code>
#------------------------------------------------------------------------------

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

# deb http://deb.debian.org/debian bullseye-backports main

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

deb http://deb.debian.org/debian-debug bullseye-debug main contrib non-free
#-----------------------------------------------------------------------------
</code>

asof
<code>
 % date
Thu 23 Sep 2021 12:44:28 AM EDT
</code>