Public bug reported:

upon a fresh boot or restart the lightdm greeter gtk theme shows network
applet and shutdown/reboot button in the upper right corner.
nevertheless, after a logout from an xfce session these widgets are
missing from the greeter and therefore the machine cannot be shutdown.
on some computers i can switch to console (ctrl-alt-f1) and press ctrl-
alt-del for a reboot but on some the console also does not appear (ie
it's completely black without a login prompt).

my /etc/lightdm/lightdm.conf is

[SeatDefaults]
greeter-session=unity-greeter

is it possible this is related to the pam_systemd.so module and/or
systemd itself?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.2-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Aug 13 18:35:04 2016
InstallationDate: Installed on 2015-08-23 (356 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
LightdmConfig:
 [SeatDefaults]
 greeter-session=unity-greeter
LightdmDisplayLog: (II) Server terminated successfully (0). Closing log file.
SourcePackage: lightdm
UpgradeStatus: Upgraded to xenial on 2016-03-17 (149 days ago)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1612970

Title:
  after logout from xfce, lightdm greeter has no widgets except
  accesibility (ie no shutdown etc)

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