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The Unofficial Ubuntu Starter Guide
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Q: How to disable all interactive editing control for GRUB menu?

  1. Read General Notes
  2. grub
    grub> md5crypt
    Password: ****** (ubuntu)
    Encrypted: $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password)
    grub> quit
    sudo cp /boot/grub/menu.lst /boot/grub/menu.lst_backup
    sudo gedit /boot/grub/menu.lst
  3. Find this section
    ## password ['--md5'] passwd
    # If used in the first section of a menu file, disable all interactive editing
    # control (menu entry editor and command-line)  and entries protected by the
    # command 'lock'
    # e.g. password topsecret
    #      password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
    # password topsecret
  4. Add the following line below it
    password --md5 $1$ZWnke0$1fzDBVjUcT1Mpdd4u/T961 (encrypted password above)
  5. Find this section
    title		Ubuntu, kernel 2.6.10-5-386 (recovery mode)
    root		(hd0,1)
    kernel		/boot/vmlinuz-2.6.10-5-386 root=/dev/hda2 ro single
    initrd		/boot/initrd.img-2.6.10-5-386
  6. Replace with the following lines
    #title		Ubuntu, kernel 2.6.10-5-386 (recovery mode)
    #root		(hd0,1)
    #kernel		/boot/vmlinuz-2.6.10-5-386 root=/dev/hda2 ro single
    #initrd		/boot/initrd.img-2.6.10-5-386
  7. Save the edited file (sample)
The Unofficial Ubuntu Starter Guide
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  Published under the terms of the GNU General Public License Design by Interspire