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"