GRUB 2 is a new boot loader which comes with Ubuntu Karmic Koala. GRUB 2 is in charge of showing the menu that allows you to choose the operating system or Kernel version when your computer starts.
Changing GRUB2 Splash Image
The Ubuntu repositories already include a set of background images for GRUB 2; the package is called grub2-splashimages. To install it, simply open a terminal and paste this: