默认情况下，Ubuntu系统未为根用户设置密码。若需获得根用户权限，可通过输入已设置的用户密码实现。本文介绍如何手动为根用户设置独立密码。
As default Ubuntu has no password set for the root user. To gain root access you have to type in your own user password. This is the password you set for the first user while installing Ubuntu.
To manually set a password for the root user, type in the following in the shell:
sudo passwd
After that you are asked to type in the new root password twice. Finally, your root user has its own password.
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