Thank you for your report. Downgrading from 5.6 to 5.5 is not automatic, as described in the release notes, so a maintainer script error is expected behaviour and will need to be resolved manually, as you discovered.
** Changed in: mysql-5.5 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1308965 Title: package mysql-server-5.5 5.5.35+dfsg-1ubuntu1 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/1308965/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs