Upgrading my single VM host to Proxmox 7 without dedicated VM backups (just my normal daily backups). What could possibly go wrong?

Ugh. Interface names changes from "predictable" back to eth0 etc. kinda breaks all the host networking.

Fun. Apparently there was a leftover file,
-rw-r--r-- 1 root root 411 Oct 20 2019 /etc/systemd/network/

...that didn't have a valid configuration syntax for the current version of systemd-udevd:

systemd-udevd[9256]: /etc/systemd/network/ No valid settings found in the [Match] section, ignoring file.

Removing that file solved the problem (though right now I'm not sure of the defaults from /usr/lib/systemd/network/ are now used nor not.)

So this took considerably more time than expected, but at least it made me write a short blog post for a change.

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