如果最初没有设置密码，可以更改密码吗？
下面的状态是password unchanged，但是从哪里开始呢？它是用随机值初始化的吗？
Enter new UNIX username: user1
New password:
Retype new password:
Sorry, passwords do not match.
passwd: Authentication token manipulation error
passwd: password unchanged
Try again? [y/N] N
Installation successful!
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
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