Possibly this is related: https://wiki.ubuntu.com/XenialXerus/ReleaseNotes#MySQL_5.7
My belief is that ubuntu-release-upgrader can't handle this kind of issue in a specific application. One way might be some kind of maintainer script in the mysql-5.7 package. ** Also affects: mysql-5.7 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1725222 Title: do-release-upgrade from Ubuntu 14.04 to 16.04.1 performs unsupported upgrade from MySQL 5.5 to 5.7 To manage notifications about this bug go to: https://bugs.launchpad.net/serverguide/+bug/1725222/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs