On Wed, Oct 19, 2016 at 01:49:54PM -0300, Felipe Sateler wrote: > Mariadb and mysql are supposed to be drop-in replacements, so switching > between them should be supported.
This is incorrect. They aren't drop-in replacements. MariaDB changes the internal database format in ways that MySQL doesn't understand. There is no automated way to switch back. I'll leave this bug open because I think the UX could be better, but they need pretty extensive refactoring of how MySQL and MariaDB packages interact. I'd like for it to be possible for the user to end up with the option of having a blank database when switch back to MySQL with the MariaDB database retained, for example. However, I don't think it'll ever be possible to switch back automatically, as this is simply not supported by the upstreams. This is also tracked downstream in Ubuntu at https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1490071.
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