Comment 30 for bug 444349

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Ben Vitale (bvitale3002) wrote : Re: package mysql-server-5.1 5.1.37-1ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

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.