How to switch to root user in ubuntu

How to switch to root user in ubuntu, use the following command

su root

But for a Linux system that has just been installed, it will prompt that the password is wrong after entering the password, because no password is set for root.

Solution:

enter:

sudo passwd root

Enter a password, and confirm the password.

Re-enter the command: su root, then enter the password, and find that you can switch to root authority.

Switch back to normal user from root:

exit