How to change Grub in ubuntu

Unlike other grub versions, Grub 2 can be edited from the GUI and it is very easy
here is the steps for Ubuntu 10.04,

open a terminal and run

sudo grub update

when the Grub update finished, run

sudo apt-get install 

for this you will need an Internet connection, if not download it from here
now open System->Administration->Startup-Manager