How to Fix Error "The value 'buster-backports' is invalid for APT::Default-Release as such a release is not available in the sources"
Hello,
I'm currently facing a weird issue after performing a dist-upgrade
from buster to bullseye. Apparently, apt is able to fetch
bullseye-backports from the server correctly:
<code>
root:~# apt update -y
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 https://updates.signal.org/desktop/apt xenial InRelease
Hit:3 https://brave-browser-apt-release.s3.brave.com stable InRelease
Hit:4 http://deb.debian.org/debian bullseye-backports InRelease
Hit:5 https://deb.debian.org/debian stable InRelease
Hit:6 https://deb.debian.org/debian stable-updates InRelease
Hit:7 https://deb.debian.org/debian-security bullseye-security
InRelease
Hit:8 http://deb.anydesk.com all InRelease
Hit:9 https://nginx.org/packages/mainline/debian buster InRelease
Get:10 https://zoralab.gitlab.io/bissetii/releases/deb master
InRelease [2,689 B]
Fetched 2,689 B in 1s (1,895 B/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
</code>
However, when I do a simple package search from backport, it threw the
following error:
<code>
root:~# apt -t buster-backports search linux-image-amd64
E: The value 'buster-backports' is invalid for APT::Default-Release as
such a release is not available in the sources
E: The value 'buster-backports' is invalid for APT::Default-Release as
such a release is not available in the sources
</code>
My /etc/apt/sources.list.d/debian-releases.list is as follows:
<code>
deb https://deb.debian.org/debian-security bullseye-security main
contrib non-free
deb-src https://deb.debian.org/debian-security bullseye-security main
contrib non-free
deb http://deb.debian.org/debian bullseye-backports main contrib non-free
deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free
</code>
If I switch it back to 'buster-backports'. It is all working fine. I
ran out of clues to debug this problem. Any pointers?
Thanks in advance.
Regards,
Kean Ho
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