第一步：安装openssh-server

#sudo apt-get install openssh-server

第二步：查看ssh服务是否已经运行，执行

#ps -e | grep ssh

执行完后可以看到ssh-agent和sshd都运行了。

第三步：重启shh服务

#service sshd restart

第四步：从别的机器上用secureCRT登录Ubundu机器，输入用户名密码，终端显示：

Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-23-generic-pae i686)

* Documentation:  https://help.ubuntu.com/

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

hy@hy-Aspire-SA10:~$ pwd
/home/hy

这说明SSH服务已经成功了。

至此全文结束，有问题还望您提出。