Boot from Ubuntu Live CD until the desktop appear.
Open terminal
$ sudo grub
We will enter to the GRUB prompt
grub>
After that we must look for the location from the first time GRUB installation.
grub> find /boot/grub/stage1
the result is location where the GRUB was installed, ussualy is like this:
root(hdx,y)
Where x and y is number. Type in the GRUB prompt accordance with result, for example if the result is root(hd0,0), so we must type:
grub> root(hd0,0)
Install GRUB to hardisk MBR with this command:
grub> setup(hd0)
Why hd0? I was assumed our harddisk is primary. There is some info that showing to us if GRUB was well installed on MBR. Done, we must quit from GRUB prompt:
grub> quit
Now it’s time to add boot options for other OS, for example Windows XP.
Open terminal and then
$sudo gedit /boot/grub/menu.lst, then add this following line :
title Windows XP
root (hd0,1)
makeactive
chainloader +1
Pay attention to line root (hd0,1), it means, Windows partition is in second partition (showing by number 1) and on Primary Harddisk (showing by number 0). Change that value according to condition that exist.
Back to terminal:
$sudo reboot
Now we can see GRUB again ^_^
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