Ugh, I fail at reportbug again :( real sorry about the initial report.
here's the real description of the problem: when upgrading from jessie to stretch, the upgrade goes through without an error but the end result is that mysql-server-5.5 gets removed and mysql is not running anymore. stretch is supposed to push ppl towards mariadb according to the (still work in progress) release notes, however mariadb doesn't get installed. There is no mysql-server, mysql-server-* or mysql-client-* packages in stretch so I believe this to be the source of the issue. One can fix the problem either by adding default-mysql-server before upgrading or after. however this poses a problem: * before the upgrade, the default-mysql-server package is only available in jessie-backports * after the upgrade, you've gotten no notice at all about what's happening and why the mysql server is not running and not upgraded. One way to make this an easier transition would be to have a mysql-server package in stretch that's a dummy package that depends on default-mysql-server, and that has an upgrade notice about the transition to mariadb that is happening.
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