How does Ubuntu use apt-get to update the Internet through proxy?

Ubuntu accesses the Internet through proxy, and how to use apt-get to update. If your company's network architecture accesses the Internet through a proxy server, Ubuntu may encounter problems when using apt-get updates. Even if you have configured a System-wide proxy server (System wide proxy server ). Generally, the following error occurs when executing commands such as apt-get update: 407 Proxy Authentication Required is simple. You only need to change the apt-get configuration file, modify/etc/apt. conf content:
$ Cat/etc/apt. conf www.2cto.com Acquire: http: proxy "http: // username: passowrd @ proxy: 80/"; Acquire: ftp: proxy "ftp: // username: password @ proxy: 80/"; Acquire: https: proxy" https: // username: password @ proxy: 80 /";
Username, password, proxy, and port must be modified according to the actual conditions. In this way, you can update the system. Reference: http://askubuntu.com/questions/88976/407-proxy-authentication-required