输入命令：ssh localhost_执行ssh localhost 之后ll命令

输入命令：ssh localhost

显示：

The authenticity of host 'localhost (127.0.0.1)' can't be established.
ECDSA key fingerprint is 34:69:fc:a8:92:c0:53:1e:06:1b:da:ef:44:1a:05:de.
Are you sure you want to continue connecting (yes/no)?

输入yes，显示：

Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-29-generic-pae i686)

 * Documentation:  https://help.ubuntu.com/
Last login: Sun Jun 23 06:21:25 2013 from 192.168.159.1

说明安装成功（第一次登陆时会询问是否继续连接，输入yes即可连接）