Ubuntu su 认证失败/authentication failure

新版Ubuntu系统(11.04以后)默认不允许su到root。所以要先设置root的密码才能进行 su 操作

user@user-ubuntu~$ sudo password
[sudo] password for [user]
Enter new UNIX password:
Retype new UNIX password:
password: password updated successfully


New Ubuntu (after version 11.04) not allow use access to root by deafult. Therefore, user need to set password so that can do su operation.

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