virtualbox - video device

 
1. Open a terminal (look above if you don't know how)

2. Type 'sudo gedit /etc/X11/xorg.conf'

3. Type your password (needs root-rights again and afterwards a text editor should appear )

4. Find:
Section "Device"
       Identifier "Configured Video Device"
EndSection

5. Change to:
Section "Device"
       Identifier "Configured Video Device"
       Driver  "vboxvideo"
EndSection

6. Save (press ctrl+s)

7. log out and log back in (restarting also works)