[ubuntu] Default GRUB splash screen Ubuntu 12.04

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http://ubuntuforums.org – I tried the XFCE4 desktop manager for some reasons and decided to stick with Unity. The thing is, when I installed XFCE4 it changed the GRUB menu background from the plain purple splash screen into some spacey pic. I'd like to get the default plain purple GRUB menu. How can I do that? (Hardware)