Ran into this while running Vmware Workstation under Ubuntu Jaunty. I got an error while shutting down the machine through an NX session.
This is a result of a zombie ‘vmware-vmx’ process running. All you need to do is kill the process. This command sends ’signal 9′ to the process. When sent to a program, SIGKILL [...]
Vmware – Unable to change virtual machine power state: Internal error.