Problem: MySQL/ MaraiaDB Does Not Start After Upgrading to UCS 4.3-0

Problem

After updating from UCS 4.2 to UCS 4.3-0 the database mariadb does not start any longer.

Solution

Before upgrading make sure the package univention-mysql is installed. When installed it will smoothly migrate from MySQL to mariadb.

Option 1

You should revert to an snapshot, if possible. Once reverted, install univention-mysql by univention-install univention-mysql.

Option 2

If there is no snapshot you might want to remove any mysql and myriadb packages with apt. Once cleaned, re-install with univention-install univention-mysql.
Note: Option 2 is untested and you might loosing data this way.