How to change the ‘root’ password from Grub

How to remove root user password from Grub.

It will only work if the root (/) disk or partition is not encrypted.

In Grub, press e:

I add, as the following images show, init=/bin/bash to the line linux /boot[...]:

Press Control + x to boot.

Now I have the system mounted in read-only mode:

I remount in write mode:

# mount -o remount rw /

Now I can edit the /etc/shadow file:

# nano /etc/shadow

And I delete any characters between the first two colons on the line that starts with root:

After restarting, I log in as root without a password. The first thing I will do is assign a new one:

# passwd

Grub GNU Linux