First we’ll have to download the grub2 splash image package for Ubuntu. Open up the terminal Application > Accessories > Terminal and type following command:
sudo apt-get install grub2-splashimagesThis will install the splash image package under direcotry /usr/share/images/grub/, navigate to this directory and check out some Grub2 splash Images that you can use.
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source:http://linuxpoison.blogspot.com/2010/11/13578167756858.html