It seems to me like there are a lot of posts in the last few days, they all have one thing in common, "after a recent update and upgrade",... this or that does not work any more.... I have not tried doing any updates or upgrades,since about a month ago, maybe it would be wise not to ? I wonder what the deal is, why so many are having problems ? Maybe it is just that there are many users that disregard the
https://wiki.debian.org/DontBreakDebian wiki advice and have non Debian repos in their /etc/apt/sources.list ?
Debian Stable should not be combined with other releases. If you're trying to install software that isn't available in the current Debian Stable release, it's not a good idea to add repositories for other Debian releases. The problems might not happen right away, but the next time you install updates.
The reason things can break is because the software packaged for one Debian release is built to be compatible with the rest of the software for that release. For example, installing packages from bullseye on a buster system could also install newer versions of core libraries including libc6. This results in a system that is not testing or stable but a broken mix of the two.
Or:
From:
https://wiki.debian.org/DontBreakDebian>>>If you absolutely must have the proprietary closed-source drivers, do not download them directly from the manufacturer's website! Installing drivers this way only works for the current kernel, and after the next kernel update, your video drivers will not work until they are manually reinstalled again.
Fortunately there is a Debian way to install video card drivers using packages in the repository. Installing the drivers the Debian way will make sure that the drivers continue to work after kernel updates.
The above is probably the most common causes or problems when updating and upgrading, if Debian has become like Linix Mint and Ubuntu, and pushes packages that are not ready for the updates or upgrades, well that would be a problem as well, but to be honest,in the past they all ways have been pretty good about that, and updating/upgrades have been safe enough,...... Any one else care to share on this ?