Network

DNS

vim /etc/resolv.conf

nameserver 8.8.8.8
nameserver 8.8.4.4

$ sudo touch /etc/apt/apt.conf.d/proxy.conf
$ sudo gedit /etc/apt/apt.conf.d/proxy.conf

Acquire {
  HTTP::proxy "http://127.0.0.1:8080";
    HTTPS::proxy "http://127.0.0.1:8080";
    }