When 2D and 3D acceleration is enabled within VPS Configuration it will show "1) The operation could not be completed" after booting or restarting the server.
The solution is simple. Disable the Acceleration option and try again.
Newer operating systems don't require to enable Acceleration. It is already included by default when the VGA option is enabled.
The 2D and 3D acceleration option only appears in the web interface because there are still older versions in production.