How to activate an administrator for the Linux Ubuntu

Ubuntu input su input password hint su:authentication failure problem Resolution:

sudo passwd 
password: Your current password  
enter New UNIX Password: This is the root password  
retype New UNIX Password: duplicate root password  
Then you will 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.

If a small black box appears, it is a language issue. Input lang= "En" can be resolved.

How to activate an administrator for the Linux Ubuntu