ubuntu22.04桌面版默认不支持root用户登陆，测试环境每次都要敲个sudo，实在麻烦

  1. 先给root用户设置密码
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    sudo passwd root
  2. 将下面两个文件/etc/pam.d/gdm-password和/etc/pam.d/gdm-autologin中的一行代码
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    auth required pam_succeed_if.so user != root quiet_success
  3. 修改/root/.profile文件
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    - mesg n 2＞ /dev/null || true
    + tty -s && mesg n || true
  4. 修改/etc/gdm3/custom.conf，没有这个文件就在设置里开启自动登录，或者自己创建
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    # GDM configuration storage
    #
    # See /usr/share/gdm/gdm.schemas for a list of available options.

    [daemon]
    AutomaticLoginEnable=true
    - AutomaticLogin=pblood
    + AutomaticLogin=root

    # Uncomment the line below to force the login screen to use Xorg
    #WaylandEnable=false

    # Enabling automatic login

    # Enabling timed login
    #  TimedLoginEnable = true
    #  TimedLogin = user1
    #  TimedLoginDelay = 10

    [security]

    [xdmcp]

    [chooser]

    [debug]
    # Uncomment the line below to turn on debugging
    # More verbose logs
    # Additionally lets the X server dump core if it crashes
    #Enable=true

另外，桌面版也不支持root用户远程登陆，下面是开启方法

  1. 安装openssl-server
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    apt install openssh-server
  2. 修改/etc/ssh/sshd_config文件
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    - #PermitRootLogin prohibit-password
    + PermitRootLogin yes
  3. 重启ssh服务
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    service ssh restart
    测试：
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    ssh root@localhost