Bug#992980: gnome-shell complains if using lightdm

[Grand T]

This notification is a regression.
Here are my investigations
 /usr/lib/systemd/system/

gdm.service  => BusName=org.gnome.DisplayManager

lightdm.service =>  BusName=org.freedesktop.DisplayManager

Gnome-shell don't check yhe bus to talk to.

I suspect this is the cause

https://metadata.ftp-master.debian.org/changelogs//main/g/gnome-shell/gnome-shell_3.38.4-1_changelog

gnome-shell (3.33.90-1)
+ Call GDM’s RegisterSession() after startup (LP: #1798790)
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