Public bug reported:

With a fresh installation of Ubuntu 20.04.1,
adding the following to /etc/gdm/custom.conf

[xdmcp]
Enable=tue
ShowLocalGreeter=false

works fine. But with ShowLocalGreeter=true,
gdm3 does not show a login box to a remote X server.
journalctl -u gdm shows "GdmDisplay: Session never registered, failling"

If the combination of Enable=true and ShowLocalGreeter=true is unsupported,
Enable=true should also mean ShowLocalGreeter=false.

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gdm3 (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: focal

** Bug watch added: Debian Bug tracker #970212
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970212

** Also affects: gdm3 (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970212
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1895420

Title:
  gdm3 with xdmcp does not show login box to a remote X server

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