Debian micronews

If your APT configuration also involves pinning or APT::Default-Release, it is likely to require adjustments as the codename of the security archive no longer matches that of the regular archive. More details and examples in https://www.debian.org/releases/bullseye/amd64/release-notes/ch-information.en.html#security-archive #NewInDebianBullseye #ReleasingDebianBullseye