no "release file"?

[HLing]

...
Thank you I_gyuri, I messed up trying.  I realize my etc/apt/sources.list has some questionable entries.  Can someone show me what should be in it? I've managed to add a duplicate line, but prior to that there seems to be some other errors...help!

I have:

Code:

$ uname -a
Linux mobian 5.8-sunxi64 #6 SMP Sun Oct 18 12:56:04 UTC 2020 aarch64 GNU/Linux
mobian@mobian:~$ lsb_release -a
No LSB modules are available.
Distributor ID:    Debian
Description:    Debian GNU/Linux bullseye/sid
Release:    testing
Codename:    bullseye
mobian@mobian:~$ cat /etc/apt/sources.list
deb http://deb.debian.org/debian bullseye main
mobian@mobian:~$

dukla2000, thank you!  Is that really all we need?! I don't know why but I have in my backup file:

deb http://deb.debian.org/debian bullseye main
deb http://security.debian.org/ bullseye/updates main
deb http://deb.debian.org/debian bullseye-updates main
deb http://deb.debian.org/debian bullseye-proposed-updates main

(!?)