This bug was fixed in the package lightdm - 1.18.3-0ubuntu1

---------------
lightdm (1.18.3-0ubuntu1) xenial; urgency=medium

  * New upstream release:
    - Fix error that caused stdin to be closed. This seems to have lots of bad
      side effects (greeter not working correctly, multi-seat failing).
    - Add support for greeters running inside sessions. This is enabled by
      setting X-LightDM-Allow-Greeter inside the session .desktop file.
      The session can then use liblightdm to connect one greeter to the
      daemon. The communication is done using a socket
      (/var/run/lightdm/<user>/greeter-socket) that is accessible to any
      process run by that user. Consider controlling access to this socket
      using a MAC system such as AppArmor. (LP: #1582242)
    - Fix various memory management issues exposed by the use of in-session
      greeters.
  * debian/patches/lp1605117.patch:
    - Applied upstream

 -- Robert Ancell <robert.anc...@canonical.com>  Fri, 12 Aug 2016
11:37:43 +1200

** Changed in: lightdm (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1582242

Title:
  Support a user-session mode for authenticating

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.18 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Xenial:
  Fix Released
Status in lightdm source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  Ubuntu phone development requires in session greeter functionality to perform 
suitably. This functionality does not exist in current versions of LightDM.

  [Test Case]
  1. Install a session that supports in session greeter
  2. Log into that session
  3. Activate greeter functionality

  Expected result:
  It works

  Observed result:
  The functionality is not implemented.

  [Regression Potential]
  Some risk of changing existing behaviour, reduced by regression tests still 
passing. Functionality is only enabled for sessions that opt-in to this 
behaviour so additional security risks is limited to new sessions.

  Original description:

  We talked about this in person in Prague.

  Ideally a greeter could run as in the user's session and act as a
  lockscreen for the user as well as a way to authenticate/log-in as
  other users.

  This would let us avoid running a whole other session for the greeter
  on the phone, which is memory intensive.

  It might be easiest for unity8 if that API was still just liblightdm,
  just running in a special mode.  But I'm not picky on how it's done.

  There may be security questions around this.  I asked Jamie and Tyler
  about it, I'll post any concerns from them.

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