Comment 9 for bug 977069

(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.