centos-切换root账户错误

虚拟机输入su出现以下错误

[lcm@localhost ~]$ su
Password: 
su: Authentication failure

执行sudo root

[lcm@localhost ~]$ sudo root
[sudo] password for lcm: 
lcm is not in the sudoers file.  This incident will be reported.

所以需要添加root账户

快捷键command+L,或者重启虚拟机，登陆页面选择log in as another user按键

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创建root，密码root,成功后
再切回原账户，command+L,或者重启虚拟机，

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成功！