When I start Ubuntu from the grub, I get a strange message, and a medieval prompt as:
No init found Busybox v1.15.3(ubuntu 1.1.15 3-ubuntu5) built in shell (ash) Enter 'help' for a list of commands (initramfs)_
I use a dualboot system, with Ubuntu Meerkat, and Windows 7. Is there any chance of recovery? Thanks.
EDIT: The PC on a whim decide to boot itself up, and so I couldnt try the solution mentioned below. I will accept the answer anyway.