Verified: echo "invalid_mysql_option=foo" >> /etc/mysql/my.cnf. Then on upgrade it should fail to start and complain - now with a reasonable message. Going from Trusty -> Xenial-Proposed now with aforementioned change in place I see:
ERROR: Unable to start MySQL server: 2016-07-20T13:15:02.743028Z 0 [ERROR] unknown variable 'key_buffer=16M' 2016-07-20T13:15:02.746251Z 0 [ERROR] Aborting Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ for tips on fixing common upgrade issues. That is one of the old variables (now key_buffer_size) which just reflects what would happen on old custom-config. => Verified ** Tags removed: verification-needed ** Tags added: verification-done -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1602763 Title: postinst does not print a helpful message when the server will fail to start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1602763/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
