I'm having trouble with Ubuntu. It was working fine on Weds 24/08/12. Fired up my laptop yesterday and came up with the Grub screen.

What I basically want to know is how do I get back to normal service?

I'm pretty illiterate when it comes to Ubuntu/Linux systems.

I think I'm running the latest version of Ubuntu. Currently using the 11.10 trial which I burnt to disc to use my laptop at the minute to post this question.

This is the first screen I get come up. 'http://img.photobucket.com/albums/v419/R1187/20121025_173033.jpg'

Following the first option it just takes me to a black screen with a flashing underscore. Pretty sure it doesn't allow me to enter any text.

When I follow the second option I get this screen:

I've tried following the advice on this question, but it hasn't done the trick. It keeps asking me if it's mounted.

Any help will be appreciated. Ideally I'd like to get things back to normal. Failing that copying my data from the hard drive to an external one and reinstalling Ubuntu would be fine.