[Bug 1455773] Re: mysql will not start after 5.5 to 5.6 upgrade

[km]

It does in fact  appear to be an apparmor problem, the kern.log has
multiple

May 18 08:51:39 orac kernel: [79075.568386] audit: type=1400
audit(1431953499.358:167): apparmor="DENIED" operation="open"
profile="/usr/sbin/mysqld" name="/etc/mysql/mysql.conf.d/" pid=7960
comm="mysqld" requested_mask="r" denied_mask="r" fsuid=122 ouid=0

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Title:
  mysql will not start after 5.5 to 5.6 upgrade

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