http://askubuntu.com/questions/711889/err-apt-get-update-on-ubuntu-14-04即使给Ubuntu配置了代理,terminal能ping通网络,火狐浏览器能上网,但依然连不上网络安装软件和update,报下面的错,解决方案是: Create /etc/apt/apt.conf to add proxy configuration for APT. sudo nano /etc/apt/apt.conf Add this line t…