虚拟机下安装Ubuntu教程

虚拟机安装Ubuntu教程链接：
https://blog.csdn.net/xiaohua0877/article/details/78507631
https://jingyan.baidu.com/article/ad310e801a04db1849f49e3a.html
https://jingyan.baidu.com/article/656db918c9c63ae381249c24.html
https://jingyan.baidu.com/article/c74d6000bbc6110f6a595d3b.html