新版ubuntu20.04 使用root用户登录系统的详细教程

[Seat:*]
user-session=ubuntu
greeter-show-manual-login= true
all-guest=false #这个可以 不用配置

#%PAM-1.0
auth  requisite    pam_nologin.so
#auth  required    pam_succeed_if.so user != root quiet_success
auth  optional    pam_gdm.so
auth  optional    pam_gnome_keyring.so
auth  required    pam_permit.so

#%PAM-1.0
auth  requisite    pam_nologin.so
#auth  required    pam_succeed_if.so user != root quiet_success
@include common-auth
auth  optional    pam_gnome_keyring.so
@include common-account

# ~/.profile: executed by Bourne-compatible login shells.

if [ "$BASH" ]; then
 if [ -f ~/.bashrc ]; then
  . ~/.bashrc
 fi
fi
tty -s && mesg n || true
mesg n || true