Virtual box download the latest VBoxGuestAddition for high resolution

http://download.virtualbox.org/virtualbox/

Kernel driver not installed (rc=-1908)

The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module by executing

'/etc/init.d/vboxdrv setup'

as root. If it is available in your distribution, you should install the DKMS package first. This package keeps track of Linux kernel changes and recompiles the vboxdrv kernel module if necessary.

VBOX check the state of a VM

text=`vboxmanage showvminfo MACHINE_NAME | grep State: | awk '{print $2}'` ; if [ $text == "running" ] ; then echo OK ; else echo "NOTOK" ; fi