参考文章：Ubuntu修改密码和用户名
更改密码：sudo passwd [用户名]
文章目录
20230816Ubuntu中如何更改用户名和密码更改用户名步骤1：更改用户名步骤2：更改主目录的名称
更改密码
20230816
Ubuntu中如何更改用户名和密码
在Ubuntu中，用户可能需要更改他们的用户名和密码来增强安全性或者简单地将其设置为他们可以轻松记住的内容。这篇文章详细解释了如何通过命令行进行这些更改。
更改用户名
更改用户名涉及到两个步骤：首先更改用户名，然后更改主目录的名称以反映新的用户名。
步骤1：更改用户名
要更改用户名，必须使用usermod命令。这需要管理员权限，因此请确保使用sudo。
sudo usermod -l new_username old_username
在这个命令中，-l选项用于指定新的登录名，new_username是希望设定的新用户名，old_username是当前的用户名。
注意: 在执行此命令之前，请先注销当前用户，并作为其他用户或root用户登录。因为不能在登录时更改用户名。
步骤2：更改主目录的名称
只是更改了用户名是不够的，我们还需要更改与该用户关联的主目录的名称。再次使用usermod命令：
sudo usermod -d /home/new_home_dir -m new_username
在这个命令中，-d选项用于指定新的主目录，new_home_dir是新的主目录名称，-m选项意味着移动用户的家目录到新位置，new_username是已经更改的新用户名。
现在，新的用户名已经准备好使用了。
更改密码
更改密码是一个相对简单的过程，可以通过passwd命令实现。
sudo passwd username
运行上述命令后，系统将提示输入新密码，并要求确认。其中username是要更改密码的用户名。
这就完成了更改用户名和密码的全部过程。
参考文章:
How to Change User Password in UbuntuHow to Change Username in Linux
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