一.我遇到的问题
我按照以下步骤连接：
1、打开ubuntu终端，输入命令ifconfig，查看虚拟机ip
可以看到inet addr（ip地址），用于xshell新建会话中的主机地址
2、打开xshell，新建会话
点击连接，出现了红色框内的连接失败提示（有的版本没有连接按钮，点击确定即可，然后双击刚新建的会话，我的是ubuntu）
二.原因及解决办法
原因
ubuntu没有开启ssh服务，也没有安装ssh服务
解决办法
1、打开ubuntu终端
2、安装ssh服务（如果已安装ssh服务，可跳转至第3步）
sudo apt-get install openssh-server或者
sudo apt-get install openssh-server openssh-client3.启动ssh
sudo service ssh restart若启动成功，有如下提示：
4.查看ssh服务状态
sudo service ssh status若服务开启成功，则有如下提示：
5. 与xshell连接
若连接成功，则有：
此教程来自固定链接： http://www.rakbuluo.com/p48/
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