ubuntu debian apt conf proxy
# apt.conf - proxy and local overrides
Acquire::http::Proxy "http://192.168.0.110:3142";
APT::Get::AllowUnauthenticated "true";
Acquire::http::proxy::mas-01 "DIRECT";
# alternative
Acquire
{
http {
Proxy "http://192.168.0.110:3142";
Proxy::192.168.2.81:9876 "DIRECT";
}
}