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[Robert Katzschmann <1545302@xxxxxxxxxxxxxxxxxx>]

Hello Mike, 
Dariusz ppa fix does not work for me on trusty, @Mike can you post your configuration for?:
/etc/network/interfaces
/etc/wpa_supplicant/wpa.conf?

I am using this configuration:

/etc/wpa_supplicant/wpa.conf:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
 ssid="duckietown"
 scan_ssid=1
 psk="something"
 priority=10
}

/etc/network/interfaces:
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

# The loopback network interface
auto lo
iface lo inet loopback

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

# Wifi settings
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

Any advice?

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Packages, which is subscribed to wpa in Ubuntu.
https://bugs.launchpad.net/bugs/1545302

Title:
  wpa-roam broken by fix for ifupdown #1337873

Status in wpa package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

   * In some configurations recurrent ifup/down calls are broken due to
  a false-positive recursion detection.

   * In certain situations it leaves interfaces unconfigured (in this
  case: WLAN interface connected to WiFi network, but dhcp fails).

  [Test Case]

   * Setup wpa-roam configuration based on what is in comment #6
   
   * Wait until wpa_supplicant connects to a wifi network

   * Run ifconfig to check if the WLAN interface received dhcp info

   * Expected result: WLAN is fully configured according to dhcp settings
   
   * Actual result: WLAN is connected to WiFi but not configured

  [Regression Potential]

   * Fixed upstream, fix present in Xenial.

   * Debdiffs contain a backport of an upstream fix.

  [Other Info]
   
   * Original bug description:

  The following versions of ifupdown introduced a recursion check using "IFUPDOWN_<interface>" environment variables along with a new locking mechanism for ifup (see #1337873):
  0.7.47.2ubuntu4.2 (in Trusty)
  0.7.54ubuntu1.1 (in Wily)
  0.7.54ubuntu2 (in Xenial)

  This recursion check breaks the wpa-roam feature of wpasupplicant,
  preventing it from loading the logical interface specified by id_str
  after associating with an AP.  Specifically, after upgrading to one of
  the above ifupdown versions, the '/sbin/ifup -v --force
  "$WPA_IFACE=$WPA_LOGICAL_IFACE"' command run by wpa_action in
  functions.sh fails with an "ifup: recursion detected for parent
  interface wlan0 in post-up phase" error.

  To fix the issue, functions.sh needs to run `unset
  "IFDOWN_$WPA_IFACE"` before calling /sbin/ifup to prevent ifup from
  detecting the recursion.  The attached patch implements this change.

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