(In French, for Sébastien: Mais oui, bien sûr, dire que quelqu'un est de
mauvaise foi c'est une attaque personnelle... On aura tout lu.)

Yes, I think you're often too prompt to reassign bug reports when they
don't mention gnome/unity/something-managed-by-the-desktop-team, without
thinking about the real issues or even reading the bug... And we usually
end up doing some funny ping pong sessions because we're both stubborn
and don't listen to each other?

Back on topic:
* lightdm-gtk-greeter and unity-greeter share similar maintainer scripts
* they both use --keep-old in postinst, so there's no way installing 
lightdm-gtk-greeter after unity-greeter (or the opposite) would set gtk-greeter 
by default
* in the postrm, --remove will only remove the greeter if it's the one 
currently set in the config file.

So the issue is that our current postrm scripts will set greeter to ""
when we remove the greeter currently set in the config file, and so
break lightdm... We can patch lightdm-set-defaults to select a random
greeter instead of doing that, or switch to what Yves-Alexis did in
Debian (manage greeters with update-alternatives). Voilà.

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https://bugs.launchpad.net/bugs/977069

Title:
  After installaing and removing lightdm-gtk-greeter lightdm is left in
  a not working state

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