I have been using Ocelot for a week now, and it had been working pretty well. But now when I try to boot into Ubuntu, it gets stuck at this point, after the splash screen:

{apologies for the low quality image}

I changed from Unity to Gnome yesterday, if it is relevant, and used it for a couple of hours as well. I can't think of anything I have changed besides that. Please help me out here, and bear with my noobness.