Here, we have explained how to set the proxy settings in ubuntu system through which effect the system through out. Web Browsers, Terminal, Synaptic Package Manager etc.
Network Proxy

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

If you want to configure proxy for apt-get,aptitude,wget use the following procedure

First you need to edit /etc/bash.bashrc file

gksudo gedit /etc/bash.bashrc

Add your proxy server details in the following format

export http_proxy=http://username:password@proxyhost:port/
export ftp_proxy=http://username:password@proxyhost:port/

Save and exit the file

Update the source list and you can restart your system

sudo apt-get update

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