[Bug 1435080] Re: mysql-server upgrade hangs dpkg --reconfigure (if root password is set?)

[David]

Fix doesn't work for me:

david at aquinas:~$ sudo apt-get purge mysql-server-5.6 mysql-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  mysql-server* mysql-server-5.6*
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 52.5 MB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 193939 files and directories currently installed.)
Removing mysql-server (5.6.23-1~exp1~ubuntu3) ...
Removing mysql-server-5.6 (5.6.23-1~exp1~ubuntu3) ...
/usr/bin/deb-systemd-helper: error: unable to link /etc/systemd/system/mysql.service to /dev/null: File exists
dpkg: error processing package mysql-server-5.6 (--purge):
 subprocess installed post-removal script returned error exit status 1
Processing triggers for man-db (2.7.0.2-5) ...
Errors were encountered while processing:
 mysql-server-5.6
E: Sub-process /usr/bin/dpkg returned an error code (1)

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https://bugs.launchpad.net/bugs/1435080

Title:
  mysql-server upgrade hangs dpkg --reconfigure (if root password is
  set?)

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