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Virtualbox 4 on Windows 7(host) with Kubuntu 12.04(guest): Problem with full screen resolution solved

I installed a virtual Kubuntu 12.04 machine in VirtualBox running on a windows 7 host. After installing guest additions via the virtual box menu entry Devices -> Install Guest Additions the screen resolution remained on 1024×768 despite the fact that my box supports 1920×1200. So I installed the guest additions via the console: sudo apt-get install virtualbox-guest-additions
sudo apt-get install virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11 Rebooted the system. Now i can run Full Screen Mode of the virtualbox using seamlessly the whole screen with full resolution. Problem solved for me. Maybe it helps someone else too.