Am 28.01.2017 um 11:08 schrieb Adam Borowski:
> Temporarily bump the priority of stable above 1000, it will downgrade
> everything to that release.
>

Thank you! That works great, except downgrading of mysql-server from 5.6
to 5.5 was not possible. Maybe there is something incompatible in
database format.
After downgrade I had to install mysql-server from backports to make it
work again.

--
Mit besten Grüßen
Joachim Fahrner