whats the password for root code example

Example 1: default root password ubuntu 18.04

$ sudo passwd

Example 2: how to get root password

How to change root password in Ubuntu
The procedure to change the root user password on Ubuntu Linux:

Type the following command to become root user and issue passwd:
sudo -i
passwd
OR set a password for root user in a single go:
sudo passwd root
Test it your root password by typing the following command:
su -