Wget Behind Proxy

add
export http_proxy=http://server-proxy:port
and / or
export ftp_proxy=http://server-proxy:port in your profile (.bashrc)

or in /etc/bash.bashrc file

HOWTO: Update from behind a proxy server

Ubuntu / Debian
For apt-get at the command-line
If you originally setup ubuntu server behind a proxy, the settings are stored in “apt” itself,

Checkout the following file: /etc/apt/apt.conf
else
modify it as below:
Acquire::http::Proxy “<http://your proxy:port/”;