Upgrade to Debian 11 complete

Long story short: by trying a bit too hard to clean up the server after the upgrade, I broke the system badly enough that it wouldn’t boot again despite my best efforts.

(Just to be clear, the upgrade itself went just fine and you shouldn’t be afraid of upgrading your own Debian based on my little mishap.)

In the end, I reinstalled Debian 11 from scratch and re-imported all user files. This had the added benefit that I did end up cleaning up a decade of cruft dating back to much earlier versions of that server.

There should be no noticeable difference to our users, except, again, a new SSH server key, whose fingerprint is now:

SHA256:p7jp2y5Hs+0FrPvujIsS/oEtWB7jcShLFI4wn7vTAiU

All my apologies for those two days of downtime — although averaged over the last decade, we’re still around 99% availability. Nevertheless, if you have stuff on hisoka and it looks broken, or if something needs to be reinstalled, do yell at me!

I promise once all is working fine again, I’ll try very hard to not touch anything for the next ten years.