How apt get get in to work behind a proxy server

apt-get is the command in debian based linux systems for package installation, update, upgrade and number of software package related function. But if you are behind a proxy server it will be tough issue to get update your linux system (or install relavant packages). For this you have to edit a config file in /etc/apt/apt.conf

sudo nano /etc/apt/apt.conf

and add these to this file.

Acquire::socks::proxy "socks://<username>:<password>@<proxy>:<port>/";
Acquire::http::proxy "http://<username>:<password>@<proxy>:<port>/";
Acquire::ftp::proxy "ftp://<username>:<password>@<proxy>:<port>/";
Acquire::https::proxy "https://<username>:<password>@<proxy>:<port>/";


Save the file and run apt-get again