I was using fiesty ubuntu with any problem. This morning i decided to update to
Gusty. All installation was Ok untill it asked to restart.

I hit restart button. IT WON'T BOOT UP. (i HAVE A DUEL BOOT SYSTEM WITH win xp
AND UBUNTU) IN TWO SEPARATE DRIVES)

It won't boot up to the page where I can select the OS. Before reaching there a
screen comes up.
"BUSY BOX V1.1.3(Debian 1.1.3.5UBUNTU7) Built in shell (ash)
Enter "help' for a list of built in commands"
followed by a screen full of lines like (1441.53 8089) ata....

HOW DO I RESCUE MY COMPUTER?

(I can't use WinXP either in that computer)