*** This bug is a duplicate of bug 1577712 ***
I believe that the root cause of this bug was actually bug 1577712 that
we fixed in June (Yakkety) and July (Xenial, 16.04), so am marking this
bug as a duplicate of that one. See bug 1577712 for details.
For others subscribed to this bug, or otherwise believe they're affected
by this issue: I see many comments above that I think are clearly due to
unrelated issues, so this bug is probably not the one you want.
** This bug has been marked a duplicate of bug 1577712
mysql_upgrade is called twice concurrently on upgrade from 14.04
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mysql-server-5.7.postinst fails with "Can't create database
'performance_schema'; database exists"
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