I refer this answer http://askubuntu.com/questions/760724/16-04-upgrade- broke-mysql-server/762775#762775
Works for me.. disabled status is the reason... If you enable and start mysql server with following commands sudo systemctl enable mysql.service && sudo systemctl start mysql.service Then upgrading works fine without any issue ... we had previously -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1571764 Title: mysqld fails to start after upgrade: performance_schema definition errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1571764/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
