Public bug reported:

On Ubuntu 16.04, I followed instruction to install KDE Plasma via the
Backports PPA.  This didn't work out well.  I have been in the process
of removing that installation.  The Unity greeter looks normal on
launch, and will let me log in to Unity as usual.

However, when I try to select another desktop environment, that panel
goes blank so that there's no place to log in.

Selecting shutdown from the upper right panel doesn't work.  I have to
turn the laptop over and pull the battery to restart.

A similar problem was reported as "Selecting other session in login
screen doesn't do anything" for Ubuntu 12.04 at
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/918072 .  This
suggests a workaround to ..

> Edit /etc/lightdm/lightdm.conf (sudo gedit /etc/lightdm/lightdm.conf), 
> changing 
> greeter-session=unity-greeter 
> to 
> greeter-session=lightdm-gtk-greeter 

... which does show the alternative desktop environments for login.

I appreciate that Unity has been announced are stabilized in future
Ubuntu releases.  If unity-greeter will no longer be supported, what
greeter will be used in future releases?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59
Uname: Linux 4.4.0-75-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr 25 10:58:56 2017
InstallationDate: Installed on 2014-04-19 (1101 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
LightdmConfig:
 [SeatDefaults]
 greeter-session=unity-greeter
SourcePackage: lightdm
UpgradeStatus: Upgraded to xenial on 2016-09-17 (220 days ago)

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


** Tags: amd64 apport-bug gnome3-ppa third-party-packages xenial

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https://bugs.launchpad.net/bugs/1686130

Title:
  Unity greeter doesn't show other desktop environments, yet allows
  login to Unity

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