Question : Locked out of Virtual Machine?

I tried googling but didn't find anything.

Basically, someone assisgned the Read-Only role to the users group in our virtual machines and locked everybody out.

As you know, the most restrictive permissions take presedence in VM.

Any ideas how I can override this?

Answer : Locked out of Virtual Machine?

You might want to try logging into the host server as root user and changing permissions.