Add password grub boot loader

Add password grub boot loader (linux distro with grub boot loader)

1. Type grub-md5-crypt (your password)
2. Enter your password and Retype
3. Copy displayed text that shown
4. Type sudo nano /etc/boot/grub/menu.lst
5. Insert password --md5 (yuor encrypted password) in boot loader that you want
6. Press CTRL+X then Y and ENTER to close nano editor