I have had to delete a line gnu that pointed to my floppy drive. After deleting that line my system boots fine. But the line returns during next boot. How do I save the Grub after editing it?
You don't need to Delete the line, you may only comment it by putting "#" (without quote marks) before each line of that entry. However, if you want to delete and save the menu.lst you must do it after booting, not upon 'grub>' prompt.
What distro are you using? Some distros do not allow you save an altered /boot/grub/menu.lst unless you are doing it as "root". So it means do this:
user@host--$: sudo vi /boot/grub/menu.lst [replace vi to gedit if you want]
user@host--$: <Enter Password>
----- vi or geditor is launched, you can save changes using "Quit"-----
Hope this helps. Good luck.