I'm a newbie and I've got this issue: My system has set up debian_5 theme but I want to get rid of it and restore the Ubuntu 11.10 default grub theme/splash/design (as you prefer) that is I think plymouth-theme-ubuntu-logo. I installed/reinstalled it by Ubuntu Software Center, but it didn't anything. [For your curiosity: The cause of that unwanted theme (debian 5) it's that I have tried lot of packages and now I can't restore the default grub design (that I liked so much!)]