Configure apt-get behind proxy server for Ubuntu 14/15/16

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04 LTS
Release:        16.04
Codename:       xenial


$ sudo vi /etc/apt/apt.conf

Acquire::http::Proxy "http://proxy_host:port";


To make this command permanent add it to ~/.bash.rc in your home directory:

vi ~/.bash.rc


Now Check and restart the updates:

root@ubuntu:~# apt-get  update
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Get:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease [95.8 kB]
:::
Okay


To use wget behind proxy

sudo vi /etc/wgetrc

https_proxy  = http://username:password@proxy:port
http_proxy = http://username:password@proxy:port
http_proxy = http://Domain\username:password@proxy:port # (in case of LDAP)
ftp_proxy = http://username:password@proxy:port
Uncomment 'use_proxy = on'


Now  try to use  wget

root@ubuntu:~# wget http://repo.zabbix.com/zabbix/2.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_2.4-1+trusty_all.deb
--2016-03-03 06:05:26--  http://repo.zabbix.com/zabbix/2.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_2.4-1+trusty_all.deb
Connecting to 10.133.80.35:8080... connected.
Proxy request sent, awaiting response... 200 OK
Length: 2674 (2.6K) [application/x-debian-package]
Saving to: ‘zabbix-release_2.4-1+trusty_all.deb’

Okay