First let us set proxy settings in GUI and later we will set proxy in "Terminal", k!
If you are having ubuntu desktop/laptop in your office or home behind proxy this tutorial is for you.This tutorial will explain How to Configure Ubuntu desktop/laptop to use your proxy server.
Ubuntu has a setting in gnome for the Network Proxy, which should set gnome’s proxy.
First go to System--->Preferences--->Network Proxy
Once it opens click on “Proxy Configuration” and enter your proxy server,port number details click Close.
Synaptic Package Manager Synaptic Package Manager must have the proxy set, in order to update your installation using the in-built Update Manager or Synaptic GUI. Go to System--->Administration--->Synaptic Package Manager
Once Synaptic Package Manager opens click on Settings--->Preferences
Click on Network tab select Manual Proxy Configuration option and enter your proxy server,port details.If you have username,password click on Authentication to enter these details click on ok
Firefox proxy Configuration Open your firefox browser go to Edit--->Preferences
Click on Advanced and select Network tab
Select Settings option
Now select Manual Proxy Configuration and enter your proxy server,port details click on ok
Terminal Proxy Settings
If you want to configure proxy for apt-get in terminal, use the following procedure
Step1: Open terminal and go to Super user (root) using the command
Step2: now open the file bash.bashrc in gedit or any editor which is in etc/ directory
and Add your proxy server details in the following format