[Bug 1490071] Re: MariaDB writes to /var/lib/mysql after crossgrade, preventing users from reverting to MySQL without manual intervention

[Robie Basak]

> From MySQL x.x to 5.5 to 5.6 users / database admins have been
responsible for backing up their data and upgrading the database without
having the option to go back.

I expect every release to ship with only one version of (Oracle) MySQL,
and reverting an upgrade across two releases is certainly not supported.
So this is not inconsistent: within a single release, I expect a user to
be able to switch from MySQL to MariaDB and back again. I do not a user
to be able to switch from 5.5 to 5.6 and back again without user
intervention, but this is fine because that would never happen within a
single release.

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https://bugs.launchpad.net/bugs/1490071

Title:
  MariaDB writes to /var/lib/mysql after crossgrade, preventing users
  from reverting to MySQL without manual intervention

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