Ubuntu_set proxy

Setting proxy from terminal

1. For gtk3 programs such as rhythmbox and online accounts:

First you need to enter proxy settings in network settings (along with authentication):

Then apply system wide.

2. For apt,software center etc

edit the file /etc/apt/apt.conf

And then replace all the existing text by the following lines

1. Acquire::http::proxy "http://username:password@host:port/";
2. Acquire::ftp::proxy "ftp://username:password@host:port/";
3. Acquire::https::proxy "https://username:password@host:port/";
4.  

3. Environment variables

edit the file /etc/environment

And then add the following lines after PATH="something here"

1. http_proxy=http://username:password@host:port/
2. ftp_proxy=ftp://username:password@host:port/
3. https_proxy=https://username:password@host:port/

Ubuntu_set proxy

原文：http://www.cnblogs.com/tlfox2006/p/8013224.html