I had a dual booting [GRUB Loader] with Vista and the earlier version of Ubuntu which was working perfectly fine. After a manual updation with the package manager to download the latest version [which seems to have done everthing right before the restart] Ubuntu is not booting at all. It gets stuck with the Ubuntu Splash Screen with the loading bar not moving at all. Im a complete noob, but loved Ubuntu and would like to use it again. Help me please