需要修改两个文件:
nano /etc/lightdm/lightdm.conf autologin-user=root autologin-user-timeout=0
nano /etc/pam.d/lightdm-autologin #注释下面这行需要 auth required pam_succeed_if.so user != root quiet_success #auth required pam_succeed_if.so user != root quiet_success
10