What exactly happens:

In GDM, when uninstalling it sets /etc/X11/default-display-manager to
the first available display manager *package name*.  It should set it to
the full path to the display manager executable.

In LightDM, when uninstalling it doesn't change /etc/X11/default-
display-manager, so it is set to "/usr/sbin/lightdm" which is no longer
installed.  It should set it to the full path to the first available
display manager executable.

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https://bugs.launchpad.net/bugs/864174

Title:
  boot hangs waiting for lightdm after purging gdm (wrong default-
  display-manager)

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