[Solved] Login with Ubuntu graphical interface, error sorry, that didn’t work.please try again

Sorry, that didn’t work.please try again

Today, I just finished installing Ubuntu 20.04. After setting the root password, I found that the root login would report such an error:
sorry, that didn’t work.please try again

In fact, there is no problem with the command line login, which indicates that it is not the password, but the desktop environment.

vi /etc/pam.d/gdm-autologin
#Note "auth requied pam_succeed_if.so user != root quiet success"

vi /etc/pam.d/gdm-password
#Note "auth requied pam_succeed_if.so user != root quiet success"


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