After recent system update (I think I saw something kernelish but don't really remember) my Ubuntu becomes unbootable. When I select "Ubuntu" from the boot menu, I'm greeted by a GRUB console and I don't know what to do (typing help shows some helpful commands for gods, unfortunately I'm a mere mortal).
I'm doing this on Windows XP now. How do I go back to the future?
Edit: The Ubuntu was installed using WUBI