Proxy_settings

## Para configurar o proxy via comando direto no bash(terminal) use 'export' ##

## caso sua senha possua caractéres especiais, substitua desssa forma: ##
! - %21
@ - %40
# - %23
$ - %24

export http_proxy="http://<user>:<pass>@<proxy>:<port>/"
export https_proxy="http://<user>:<pass>@<proxy>:<port>/"
export ftp_proxy="http://<user>:<pass>@<proxy>:<port>/"

## instale o vim, se ainda não tiver ##
apt-get install vim

## crie variáveis de ambiente (precisa duplicar ambas em upper e lower case pq alguns apps olham p/ um ou outra) ##
vim /etc/environment 

http_proxy="http://<user>:<pass>@<proxy>:<port>/"
https_proxy="http://<user>:<pass>@<proxy>:<port>/"
ftp_proxy="http://<user>:<pass>@<proxy>:<port>/"
HTTP_PROXY="http://<user>:<pass>@<proxy>:<port>/"
HTTPS_PROXY="http://<user>:<pass>@<proxy>:<port>/"
FTP_PROXY="http://<user>:<pass>@<proxy>:<port>/"
NO_PROXY="localhost,127.0.0.1,localaddress,.localdomain.com"


## crie um arquivo para configurar o apt-get 
vim /etc/apt/apt.conf.d/95proxies

Acquire::http::Proxy "http://<user>:<pass>@<proxy>:<port>/";
Acquire::https::Proxy "http://<user>:<pass>@<proxy>:<port>/";
Acquire::ftp::Proxy "ftp://<user>:<pass>@<proxy>:<port>/";


## creditos: https://askubuntu.com/questions/175172/how-do-i-configure-proxies-without-gui ##