mysql_upgrade "FATAL ERROR: Upgrade failed"

[NickolaiLeschov]

When I ssh to the server and run mysql_upgrade, it returns:

Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/lib/mysql/mysql.sock' 
Failed to ALTER DATABASE `#mysql50#.cache` UPGRADE DATA DIRECTORY NAME
Error: Incorrect database name '#mysql50#.cache'
Failed to ALTER DATABASE `#mysql50#.config` UPGRADE DATA DIRECTORY NAME
Error: Incorrect database name '#mysql50#.config'
Failed to ALTER DATABASE `#mysql50#.local` UPGRADE DATA DIRECTORY NAME
Error: Incorrect database name '#mysql50#.local'
Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/var/lib/mysql/mysql.sock' 
mysqlcheck: Got error: 1102: Incorrect database name '#mysql50#.cache' when selecting the database
FATAL ERROR: Upgrade failed

I tried to delete '#mysql50#.cache' - it throws:

#1102 - Incorrect database name '#mysql50#.cache'

What can I do?

 

[cPanelMichael]

Hello

Does /var/lib/mysql/mysql50.cache exist as a directory on your system?

Thank you.

 

[NickolaiLeschov]

Does /var/lib/mysql/mysql50.cache exist as a directory on your system?

No.
But there are '/var/lib/mysql/.cache', '/var/lib/mysql/.config' and '/var/lib/mysql/.local'.

 

[cPanelMichael]

Those are not standard directories. Did you have a custom installation of MySQL at some point? Rather than removing those directories, I suggest moving them to another location and then checking to see if the same error message persists.

Thank you.