The original reporter's problem clearly states in its log message "mysql_upgrade: [ERROR] 1007: Can't create database 'performance_schema'; database exists". The cause of the reporter's problem was bug 1574168, so I am re-marking this as a duplicate.
If you have a problem with your installation, ask yourself whether you saw this particular error message. If you did, you should refer to bug 1574168. If you did not, then you have a separate problem unrelated to this bug. It may share some of the same symptoms, but it is a separate problem and it is confusing and unproductive to treat it as the same root issue as in this bug.
I understand that sometimes different root causes result in the same symptoms; however in this case, we believe we understand the problem in bug 1574168 and I'm reasonably confident that it has the same root cause.
@Reza
Why did you undupe this bug?
The original reporter's problem clearly states in its log message "mysql_upgrade: [ERROR] 1007: Can't create database 'performance_ schema' ; database exists". The cause of the reporter's problem was bug 1574168, so I am re-marking this as a duplicate.
If you have a problem with your installation, ask yourself whether you saw this particular error message. If you did, you should refer to bug 1574168. If you did not, then you have a separate problem unrelated to this bug. It may share some of the same symptoms, but it is a separate problem and it is confusing and unproductive to treat it as the same root issue as in this bug.
I understand that sometimes different root causes result in the same symptoms; however in this case, we believe we understand the problem in bug 1574168 and I'm reasonably confident that it has the same root cause.