I also had this problem with ubuntu 12.04 and mysql-server 5.5, and
Paul's fix also worked for me. Seems like a pretty silly reason for
mysql to crash.
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I don't think this problem is related to big-endianness. I just had it
on a x86 system that was upgraded from feisty - hardy - lucid. In my
case the fix was simple: apt-get install seahorse-plugins. For whatever
reason that dependency doesn't seem to be pulled in when you upgrade.
I'd recommend