VMs also run VirtualBox processes.

If a particular desktop service is not working correctly, it is worth checking that the process that should provide it is running.

• VBoxClient provides desktop services in guests running the X11 window system such as Oracle Solaris and Linux. This process runs under the ID of the user who started the desktop session and is automatically started using the following command lines when your X11 user session is started if you are using a common desktop environment such as Gnome or KDE.

  $ VBoxClient --clipboard
  $ VBoxClient --display
  $ VBoxClient --seamless

  The VBoxClient processes create files in the user's home directory with names of the form .vboxclient-*.pid when they are running in order to prevent a given service from being started twice. It can happen due to misconfiguration that these files are created owned by root and not deleted when the services are stopped, which will prevent them from being started in future sessions. If the services cannot be started, you may want to check whether these files still exist.