ubuntu下配置host的方法：打开终端输入命令：sudo vim /etc/hosts
添加以下内容：
192.30.253.113 github.com
192.30.253.113 github.com
192.30.253.118 gist.github.com
192.30.253.119 gist.github.com
修改 hosts 后,使 hosts 文件修改生效:sudo /etc/init.d/dns-clean startsudo /etc/init.d/networking restart
原文：https://www.cnblogs.com/answerThe/p/12249145.html