Ubuntu 20 - root自动登陆

1.设置root用户密码

    sudo passwd root 输入root密码

    #su   登录获取权限.切换root

2.使用root用户登陆

    sudo vi /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

    增加

        user-session=ubuntu

    #手工输入登陆系统的用户名和密码

    greeter-show-manual-login=true

    #禁用guest用户

    allow-guest=false

    #启动后以root身份自动登录

    autologin-user=root

3.修改gdm-autologin和gdm-password

    a)

    sudo vi /etc/pam.d/gdm-autologin

    注释掉auth required pam_succeed_if.so user != root quiet_success

    b)

    sudo vi /etc/pam.d/gdm-password

    注释掉auth required pam_succeed_if.so user != root quiet_success

4.修改/root/.profile 文件

    末尾修改为

    tty -s && mesg n || true

5.修改/etc/gdm3/custom.conf

    # Enabling automatic login

    AutomaticLoginEnable = true

    AutomaticLogin = root

    # Enabling timed login

    TimedLoginEnable = true

    TimedLogin = root

    TimedLoginDelay = 5