Public bug reported:

I upgraded from 20.04->21.04-21.10

Once at 21.10 everything seem to work fine (yesterday) but today a
massive lot of updates were installed (not unexpected) however during
these updates kmail stopped working.

Once I got around to restarting kmail (no change) I discovered akonadi
had crashed and would not start again.  Much digging around later it
seems it is because mysql will not start and much digging around later
it looks like the data in db_data is corrupt.  Specifically there is
something wrong with ib_logfile0 and it seems to expect ib_logfile1 to
be present but it isn't.

So at this point I made a copy of this directory and trying loads of
different stuff (found on the internet) nothing has fixed it.  Deleting
ib_logfile0 allows akonadi to start and I have my IMAP accounts but
several years worth of mail in my local mail directories has been lost.

I have no idea what has gone wrong.  kmail crashed because akonadi
crashed.  Akonadi crashed during a big bunch of updates after upgrading
from 21.04 to 21.10.  Prior to the crash it appeared to be running fine
on 21.10.

I do not know where to start with recovery of my mail or where the bug
belongs or what the bug is only that akonadi borked during updates and
it appears I've lost emails as a result.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: akonadi dist-upgrade kmail

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https://bugs.launchpad.net/bugs/1949630

Title:
  kmail upgrade to 20.10 mysql corruption / data loss

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