修改/etc/host文件，但没有权限
在etc中打开终端，然后输入sudo gedit ./hosts
添加
192.30.253.112 github.com
192.30.253.119 gist.github.com
151.101.184.133 assets-cdn.github.com
151.101.184.133 raw.github user content.com
151.101.184.133 gist.github user content.com
151.101.184.133 cloud.github user content.com
151.101.184.133 camo.github user content.com
151.101.184.133 avatars0. github用户content.com
151.101.184.133 avatars1. github用户content.com
151.101.184.133 avatars2. github用户content.com
151.101.184.133 avatars3. github用户content.com
151.101.184.133 avatars4. github用户content.com
151.101.184.133 avatars5. github用户content.com
151.101.184.133 avatars6. github用户content.com
151.101.184.133 avatars7. github用户content.com
151.101.184.133 avatars8. github用户content.com
保存后，在桌面上打开终端并输入。 sudo/etc/init.d/networking restart