networking - Proxy permission denied when executing wget command - Ask Ubuntu

i tried installing gfortran through command line. , result

premkr@premkr-lenovo-ideapad-100-15ibd:~$ sudo wget gfortran [sudo] password premkr:  --2016-10-29 01:07:36--  http://gfortran/ connecting 10.10.78.21:3128... connected. proxy request sent, awaiting response... 503 service unavailable 2016-10-29 01:07:36 error 503: service unavailable. 

does mean terminal has no internet access .my proxy works in firefox , there`s connection.

to have terminal , wget have internet access through proxy, must edit following files:

/etc/bash.bashrc /etc/environment /etc/wgetrc 

which must contain these parameters:

/etc/bash.bashrc

export http_proxy=http://username:password@proxyserver.net:port/ export https_proxy=http://username:password@proxyserver.net:port/ export ftp_proxy=http://username:password@proxyserver.net:port/ 

/etc/environment

http_proxy=http://username:password@proxyserver.net:port/ https_proxy=http://username:password@proxyserver.net:port/ ftp_proxy=http://username:password@proxyserver.net:port/ 

/etc/wgetrc:

http_proxy=http://username:password@proxyserver.net:port/ https_proxy=http://username:password@proxyserver.net:port/ ftp_proxy=http://username:password@proxyserver.net:port/ use_proxy = on 

edited 08-11-2016

to edit files, not directories, must:

open terminal,

press ctrl+alt+t

run it:

exec sudo -i nano /etc/bash.bashrc nano /etc/environment nano /etc/wgetrc 

in order add aforementioned lines where:

username = username proxy if exists password = password proxy if exists proxyserver.net = name or ip address of proxy port = port number of proxy