I happened to find [1] where some resolved it by disabling/enabling services.
But for your case that isn't sufficient, it seems to be "files leftover" and
"partial upgrade due to the former breaking the services"
[1]: https://askubuntu.com/questions/1235829/cant-get-mysql8-to-work-on-
ubuntu-20-04
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https://bugs.launchpad.net/bugs/1962369
Title:
mysql install fails - Unknown redo log format (103)
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