Public bug reported:

Migrated from last to current stable Kubuntu version.
Kmail crashes when starting, or freezes.
I did some testing to isolate the problem and found some info which might be 
useful.

1) Kmail crashes because akonadi crashes during init. Attached the log. It 
seems to be a mysql problem, dragging akonadi down with it.
2) Mysql works fine for other applications.
3) For akonadi the bin /usr/sbin/mysqld-akonadi is used. If I try starting 
akonadi, I see multiple processes trying to start this mysql bin. One prevents 
the other to start succesfully, as you can see in the attached log, test 4. 
Each bin adds a repeated block of error lines to mysql.err, in the attachment I 
cut away most of the the repeated blocks.
4) I logged in as another Linux user. Kmail was not used in this account yet. 
Akonadi starts normally in this account. Then I copied the whole dir 
/home/nico/.kde/share/apps/kmail and the files
/home/nico/.kde/share/config/kmail*
/home/nico/.kde/share/config/mail*
/home/nico/.kde/share/config/email*
Then restarted Akonadi and started kmail without any problem.

So, for this new user account all remains working fine, it seems files or
settings in /home/nico are causing this error.

Deleting the dir /home/nico/.local/share/akonadi has no effect, the dir is 
recreated and I still have the error.
Did a search on all akonadi files in my home dir:
./.local/share/akonadi/akonadiserver.socket
./.local/share/akonadi/akonadiserver.error.old
./.kde/share/config/akonadi-firstrunrc
./.config/akonadi/ <some files here, but they are recreated and therefore fresh>

I cannot find the difference, why in one account kmail / akonadi works fine, 
while in the other / my account I get crashes.
What can I do to assist in finding the cause of this problem?

** Affects: akonadi (Ubuntu)
     Importance: Undecided
         Status: New

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akonadi crashes on mysql problem
https://bugs.launchpad.net/bugs/587418
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