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Ubuntu刚安装后,不能在terminal中运行su命令,因为root没有默认密码,需要手动设定. 以安装ubuntu时输入的用户名登陆,该用户在admin组中,有权限给root设定密码. 给root用户设置密码的具体步骤: 1. 打开一个terminal,然后输入下面的命令 sudo passwd [root] 回车后会出现让你输入原始密码,新密码和确认密码, [sudo] password for you :---> 输入你的密码(你现在这个用户的密码),不回显 Enter new U