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[Laércio de Sousa <lbsousajr@xxxxxxxxx>]

It also happens with me. In my multiseat system, if I logout on a son-
seat0 seat (which has allow-user-switching=false by default), lightdm
fails to start a greeter on that seat:

DEBUG: Seat: Display server stopped
DEBUG: Seat: Active display server stopped, starting greeter
DEBUG: Seat: Stopping; failed to start a greeter
DEBUG: Seat: Stopping
DEBUG: Seat: Stopped

I guess the problem is related to seat_switch_to_greeter() calls in
session_stopped or display_server_stopped callbacks in seat.c

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https://bugs.launchpad.net/bugs/1350357

Title:
  Support disabling of user switching per seat

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Released
Status in “lightdm” package in Ubuntu:
  Fix Released
Status in “lightdm” source package in Trusty:
  Confirmed
Status in “lightdm” source package in Utopic:
  Fix Released

Bug description:
  Let me start by saying it's possible I'm missing some subtleties here,
  and if so, I'd be happy to get a more detailed explanation.

  In LightDM 1.10.1 (Trusty), unity seats are forced to enable user
  switching (in seat-unity.c).  However, I think this is something that
  should be configurable in the display manager.  In a public computing
  environment, fast-user-switching is undesirable, as it interferes with
  serial re-usability and various cleanup tasks.  Most public computing
  labs want to maintain a 1-1 relationship between individuals and
  workstations, and a workstation should either be in use by one user,
  or not in use at all.  In the past, our site has accomplished this in
  various desktop environment configurations (such as the
  org.gnome.desktop.lockdown gsettings, etc).  Unfortunately, most of
  these settings are ignored in Unity (I have filed separate bugs about
  those).

  Obviously, there are workarounds, including stealing all the other
  VTs, or playing stupid D-Bus games, or wrapping X.  Currently, our
  preferred ("preferred") solution is to have our custom greeter check
  logind and refuse to do anything other than unlock the existing
  session if a user is already logged in on an X seat, but that's not
  ideal, because you still end up with a second greeter running, and in
  fact that becomes the primary greeter when the original user logs out.

  That having been said, I believe it is the system administrator's
  prerogative to dictate that there shall be one and only one seat
  available on any given workstation, and instruct LightDM not to spawn
  any additional ones.  It would be great if this was added in future
  releases.   Alternatively, if that's not possible because of Unity
  design, it would be great if there was a way for a greeter to say to
  lightdm "I'm done, this seat is shutting down, switch back to an
  original session."  (And obviously, doing that if there is no other
  session to switch to would be an error).

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