title: mysql_upgrade - FATAL ERROR: Upgrade Failed
body: <p>I recently had my MySQL server upgraded from 5.1 to 5.5 and I'm trying to upgrade my databases using mysql_upgrade but I keep getting this error:</p>
  
  <pre><code>[root@ip-??-???-???-??? ~]# mysql_upgrade -uadmin -p
  Enter password:
  Looking for 'mysql' as: mysql
  Looking for 'mysqlcheck' as: mysqlcheck
  FATAL ERROR: Upgrade failed
  </code></pre>
  
  <p>I can't figure why this won't run. MySQL Server is running.</p>