Отключение proxy в Ubuntu

oleg@oleg-desktop:~$ cat /etc/apt/apt.conf 
#Acquire::http::proxy "http://proxy.mccme.ru:3128/"; 
#Acquire::https::proxy "https://proxy.mccme.ru:3128/"; 
oleg@oleg-desktop:~$ sudo rm /etc/apt/apt.conf 
[sudo] password for oleg:

Закомментируем строчки в файле /etc/environment

oleg@oleg-desktop:~$ cat /etc/environment 
PATH="/home/oleg/pear/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
#http_proxy="http://proxy.mccme.ru:3128/"
#https_proxy="https://proxy.mccme.ru:3128/"

Удаляем переменные proxy

oleg@oleg-desktop:~$ env | grep proxy 
http_proxy=http://proxy.mccme.ru:3128/ 
https_proxy=https://proxy.mccme.ru:3128/ 
oleg@oleg-desktop:~$ unset http_proxy 
oleg@oleg-desktop:~$ unset https_proxy 
oleg@oleg-desktop:~$ env | grep proxy

Profit!