为了解决这个问题你必须给超级用户设置密码。
In order for this to work you have to give the root user a password.
允许管理员指定超级用户组，其成员可以解密已授权内容。还允许管理员重新设置私钥密码。
Allows administrator to specify the super user group whose members can decrypt licensed content. Also allows administrator to reset the private key password.
超级用户是不能被设置密码的，原因是显而易见的。
Understand the root user was not given a password in Ubuntu for a reason…simplicity.
超级用户是不能被设置密码的，原因是显而易见的。
Understand the root user was not given a password in Ubuntu for a reason…simplicity.
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