Linux uses su to switch User tips authentication Failure solution

Just installed the virtual machine, using the Ubtun system, into the operating system, after a simple attempt, found unable to use the shutdown command to shut down, and unable to perform the SU command, prompting authentication failure

This problem arises because the Ubtun system does not activate the root user by default and requires us to do this manually, either in the command line interface or in the terminal by entering the following command:

sudo passwd

Password: Your current password

Enter New UNIX Password: This is the root password
Retype new UNIX password: duplicate root password
you will then be prompted for successful information.

in the note, using Su and sudo is different, using the SU Switch user needs to enter the user's password to switch to, while using sudo is the current user's password.

Linux uses su to switch User tips authentication Failure solution