Information
Requiring a boot password upon execution of the boot loader will prevent an unauthorized user from entering boot parameters or changing the boot partition. This prevents users from weakening security (e.g. turning off SELinux at boot time).
Error, bootloader not found in the following locations:
/boot/grub/grub.conf
/boot/grub/grub.cfg
/boot/grub/menu.lst
/boot/grub2/grub.conf
/boot/grub2/grub.cfg
/boot/grub2/menu.lst
Solution
For grub2 based systems create an encrypted password with grub-mkpasswd-pbkdf2:
# grub-mkpasswd-pbkdf2
Enter password: <password>
Reenter password: <password>
Your PBKDF2 is <encrypted-password>
Add the following into /etc/grub.d/00_header or a custom /etc/grub.d configuration file:
cat <<EOF
set superusers='<username>'
password_pbkdf2 <username> <encrypted-password>
EOF
Run the following command to update the grub2 configuration:
# update-grub