1. 题外话：install teamviewer on Ubuntu.
wget http://download.teamviewer.com/download/teamviewer_linux.deb
sudo dpkg -i teamviewer_linux.deb
teamviewer //启动
2. install ssh on Ubuntu
sudo apt-get install openssh-server openssh-client
3. 连接IP为125.216.243.220、用户名为huabo的电脑：
ssh -l huabo 125.216.243.220
yes
输入用户huabo的用户名
建立连接成功