Recently I'm installed Ubuntu 12.04. When I boot I have the option to boot two systems: Windows 7 and Ubuntu.
After installing Ubuntu connecting net then its show new updates. I updated Ubuntu. Then after updating my PC asked to restart. I restarted the PC, but now in GRUB's background changed, it shows something about Dedian Universal Operating System displayed and one globe symbol wallpaper is displayed.
How to change that wallpaper into default Ubuntu wallpaper?