/etc/init.d$ sudo vboxheadless
WARNING: The vboxdrv kernel module is not loaded. Either there is no module
         available for the current kernel (2.6.35-25-generic) or it failed to
         load. Please recompile the kernel module and install it by

           sudo /etc/init.d/vboxdrv setup

         You will not be able to start VMs until this problem is fixed.
VBoxHeadless: Error -1908 in suplibOsInit!
VBoxHeadless: Kernel driver not installed

VBoxHeadless: Tip! Make sure the kernel module is loaded. It may also help to reinstall VirtualBox.