Ubuntu Default Root Login

After entering the Linux system, first open the terminal, enter sudo passwd root, then you will be prompted to enter the current user's password, enter the password after the terminal will prompt you to set the root password, and then confirm that you can now through SU root and then enter the password into the root authority of the terminal.

How to open can choose root login

First enter the/USR/SHARE/LIGHTDM/LIGHTDM.CONF.D folder, and then go to root permissions, execute nano 50-ubuntu.conf;

Add Greeter-show-manual-login=true in the inside, and finally save the exit.

Ubuntu Default Root Login