How to change Ubuntu's root password and Ubuntu root?

How to change Ubuntu's root password and Ubuntu root?

During Ubuntu system installation, only the user password is prompted. This password can be used for normal users to temporarily obtain the root permission and perform some operations that require the root permission, without requiring us to set the root password, the root password is hard to remember! After reading some documents, find a way to change the root password and test the password!

GJ @ ubuntu :~ # Sudo passwd rootsudo: Unable to parse HOST: ubuntu enter a new UNIX Password: re-enter a new UNIX Password: passwd: the password has been successfully updated GJ @ ubuntu :~ # Su-rootroot @ ubuntu :~ #

The key is sudo passwd root. Enter the new password twice and run the su-root command to enter the root mode.