Comment 10 for bug 190359

I have this in Ubuntu 14.04.3 LTS.

$ cat interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-driver nl80211
wpa-conf path_to_wpa_conf