hi friend i'm using windows and ubuntu on my lenovo G580 Laptop which has 4GB RAM and i5 3rd generation processor.Now the problem is i tried to to install GNOME 3 on my laptop.after installed using some gooled site instructions,i got an notification that `my disk space is full so clean space`so i've cleaned TRASH and also update all packages using `sudo apt-get update`.After done these things i've restart my system.

Now i can do anything when i try to start ubuntu in my i 've got following screen : http://www.google.co.in/imgres?imgur...ed=0CDgQrQMwBg

can anyone tell me what m suppose to do 'm new to linux?