Public bug reported:

A common report is that MySQL-related maintainer scripts have failed
after files in /etc/mysql/ have been deleted. This is expected behaviour
since policy is that users' modifications of conffiles (for example,
files in /etc/mysql/) should be preserved.

The logic is that if you have modified /etc/mysql/, it is presumed that
those modifications are what you want. Packaging cannot fix up any
broken customizations for you, so for example if you have deleted those
files, then packaging will be broken.

Before attempting to fix this up, make sure to take a full backup of
your system and in particular any databases (by default in
/var/lib/mysql) in case your attempt results in destruction of your
data.

To fix this situation up, you could try purging all mysql-related
packages (particularly mysql-common, mariadb-server-* and/or mysql-
server-*) and reinstalling them. Note that just removing the packages
will not work since dpkg will preserve your local modifications to
/etc/mysql/ as designed.

Since this behaviour is by design, this is not a bug in Ubuntu that will
be fixed and so this bug's status is set to Invalid to reflect this.
Please note that the bug tracker is not a support forum. Although you
are welcome to communicate with other affected users here, please do not
expect help here since the community doesn't generally monitor bugs for
this purpose.

If you are still having problems, then you can find pointers to get help
for this sort of problem here: http://www.ubuntu.com/support/community

** Affects: mysql-5.5 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: mysql-5.6 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: mysql-5.7 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Changed in: mysql-5.6 (Ubuntu)
       Status: New => Invalid

** Also affects: mysql-5.7 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: mysql-5.5 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: mysql-5.5 (Ubuntu)
       Status: New => Invalid

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

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https://bugs.launchpad.net/bugs/1579708

Title:
  mysql maintainer scripts fail if files in /etc/mysql have been deleted
  locally

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