[Bug 1769521] Re: package mysql-server-5.7 5.7.22-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Andreas Hasenack]

Triage notes

dmesg shows some apparmor denied messages:
[271379.099691] audit: type=1400 audit(1525648982.804:66): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/2549/status" pid=2549 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[271379.099718] audit: type=1400 audit(1525648982.804:67): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=2549 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[271379.099751] audit: type=1400 audit(1525648982.804:68): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/2549/status" pid=2549 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

And the dpkg terminal log has this:
mysql_upgrade: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) while connecting to the MySQL server
Upgrade process encountered error and will not continue.
mysql_upgrade failed with exit status 11
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1

** Changed in: mysql-5.7 (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1769521

Title:
  package mysql-server-5.7 5.7.22-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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