I usually get this alert each time i start my Ubuntu that i should perform software
update, i usually ignore it. but yesterday i just decided to perform the update which
couldn't complete because my internet connection got so slow and disconnected. since then
just after i shutdown my system its being showing some black screen just after the Ubuntu
logo is done loading.
i even inserted the Ubuntu disc and tried to run from CD but just after the Ubuntu logo is
done loading i get a black screen.