ubuntu 没有sshd_config文件，不能ssh来连接

今天安装了一个ubuntu的虚拟机，但是发现安装好之后不能用putty去连接，不知道是怎么回事了，以下分别是putty连接时的截图和虚拟机中的截图，还希望那个大神告知这是怎么回事，也试过用apt-get update/install 命令了，但是还不行，不知道是怎么回事了，而且我的/etc/ssh/ 下也没有sshd_config文件，这是为什么呀

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