[Bug 1435081] Re: package mysql-server-5.6 5.6.23-1~exp1~ubuntu3 failed to install/upgrade: subprocess installed post-removal script returned error exit status 1

[cooolman]

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'mysql-server' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  mysql-client-5.6 mysql-client-core-5.6 mysql-server-core-5.6
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  mysql-server-5.6
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 50.8 MB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 85533 files and directories currently installed.)
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 (--remove):
 subprocess installed post-removal script returned error exit status 1
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/1435081

Title:
  package mysql-server-5.6 5.6.23-1~exp1~ubuntu3 failed to
  install/upgrade: subprocess installed post-removal script returned
  error exit status 1

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