Erzeuge mal mit dem Editor eine neue /etc/X11/xorg.conf mit folgemdem Inhalt:
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# VirtualBox generated configuration file
# based on /etc/X11/xorg.conf.
Section "Monitor"
Identifier "Monitor[0]"
ModelName "VirtualBox Virtual Output"
VendorName "Oracle Corporation"
EndSection
Section "Device"
BoardName "VirtualBox Graphics"
Driver "vboxvideo"
Identifier "Device[0]"
VendorName "Oracle Corporation"
EndSection
Section "Screen"
SubSection "Display"
Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
Depth 24
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection
Dann starte Linux neu.