Configuring Proxy for Ubuntu 12.04

apt utility configuration.

Add the following lines in /etc/apt/apt.conf

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

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

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

 

Or you can add the following line in file /etc/apt/apt.conf.d/01proxy

 

For terminal configuration .

 

This will set the proxy for utilities that are run from the terminal  

 

export http_proxy=http://<username>:<password>@<proxy>:<port>

export https_proxy=http://<username>:<password>@<proxy>:<port>

 

If these settings are included in .bashrc or .profile these settings will be applied at the time of user login.

 

Synaptic package manager

The synaptic package manager has option for the proxy settings to be configured in Settings ->Preferences ->Network