If you are a Debian-based GNU/Linux user, then you’re probably familiar with synaptic and apt-get to install application from software repositories. This post focussed on how to use apt-get behind proxy server/firewall which under normal circumstances, you’re unable to use apt-get.
If you’re using command-line apt-get
Edit your /etc/bash.bashrc file as root.
You can use pico or vim to edit…
>sudo vim /etc/bash.bashrc
Press ‘i’ to insert line at the end of your /etc/bash.bashrc file :
Thens press ‘ESC’ key and type ‘:wq’ to save the file and quit from vim
You can omit the username:password, if your proxy server has no password.