vignesh said:
open a terminal
sudo -s
enter your password
vi /boot/grub/menu.lst
There go to the line that says
title Ubuntu,kernel blah blah...
Add nohotplug
quiet splash nohotplug
Tell me if it works or not.
VIgnesh I think he's stuck at that point and can't get beyond it.
So, you can do two things. One is press ctrl + c and continue with the booting process. But, it isn't a good way. Then you can do what vignesh said.
Or when grub loads, highlight the line showing ubuntu linux, press e, select line which starts with kernel and add what vignesh has given at the end of the line and press esc key and then b.