Also to follow up on comment #29, after fixing the first issue, I still encountered this error, which I suspect may have been caused due to the initial upgrade failures:
ERROR 1577 (HY000) at line 1: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
Also to follow up on comment #29, after fixing the first issue, I still encountered this error, which I suspect may have been caused due to the initial upgrade failures:
ERROR 1577 (HY000) at line 1: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
And fixed it by forcing mysql_upgrade:
sudo mysql_upgrade --force -u root -p
And a restart of mysql.