oIt is very easy to change our root password when somebody get the physical acess to your system.
In order to protect your root password we can protect your GRUB using a password.The Grub password
will restrict the physical user to enter to single user mode by editing the kernel parameter at the boot menu.
If grub password is set ,then it will prompt as password in order to edit the kernel parameters at the boot menu.
the following video will demonstrate you how to set grub password to your system
THANKS
In order to protect your root password we can protect your GRUB using a password.The Grub password
will restrict the physical user to enter to single user mode by editing the kernel parameter at the boot menu.
If grub password is set ,then it will prompt as password in order to edit the kernel parameters at the boot menu.
the following video will demonstrate you how to set grub password to your system
THANKS