There are times when you want to do funky things to your computer. Sometimes, it messed up your zen. Well, when that happens, just do the Debian way. Oh, btw, it also means you could do it in Ubuntu.
1 Regenerate your settings
$ sudo update-grub
2 Reinstall GRUB on MBR
$ sudo dpkg-reconfigure grub-pc
2a Adding kernel options to GRUB
$ sudo $EDITOR /etc/default/grub
Change $EDITOR with your favourite editor. Modify the file to suit you then do the #1. Some configuration already asked when you do #2.
Feel free to comment and ask.