how to change root password in ubuntu server 18.04 code example

Example 1: default root password ubuntu 18.04

$ sudo passwd

Example 2: passwd root

Step 1: Open a Terminal Window.
    		Right-click the desktop, then left-click Open in terminal.
            Alternately, you can click Menu > Applications > Accessories > Terminal.
    Step 2: Change Your Root Password.
    		In the terminal window, type the following:
            	- sudo passwd root.