I had too many entries on the Grub menu and decided to edit it, 1st I opened a Terminal and typed;
sudo cp /boot/grub/menu.lst sudo /boot/grub/menu.lst.back
and hit [Enter], which copies the menu file to a file called menu.lst.back in the same folder.
then I typed;
sudo gedit /boot/grub/menu.lst
This opened the boot menu in the gedit text editor, I then placed # at the start of any line I did not want to show on the menu, re saved it and re booted the laptop all done.
