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** Tags added: testcase

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https://bugs.launchpad.net/bugs/804821

Title:
  gdm fails to remove if gdm is the default display manager (and another
  dm is installed)

Status in “gdm” package in Ubuntu:
  Fix Released
Status in “gdm” source package in Oneiric:
  Fix Released

Bug description:
  TEST CASE:
  1. install gdm and lightdm
  2. Set gdm as default greeter
    $ dpkg-reconfigure gdm
    and select gdm
  3. Remove gdm
    $ apt-get remove --purge gdm

  Result:
  gdm prerm script failed with exit status 10, then debconf prompt for the default display manager

  Expected
  debconf prompt is shown _before_ removing gdm and gdm removal only fails if there is no other choice than gdm

  ProblemType: Package
  DistroRelease: Ubuntu 11.10
  Package: gdm (not installed)
  ProcVersionSignature: Ubuntu 3.0-2.3-generic 3.0.0-rc4
  Uname: Linux 3.0-2-generic i686
  Architecture: i386
  Date: Sat Jul  2 02:02:19 2011
  ErrorMessage: il sottoprocesso vecchio script di pre-removal ha restituito lo stato di errore 10
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100803.1)
  SourcePackage: gdm
  Title: package gdm (not installed) failed to install/upgrade: il sottoprocesso vecchio script di pre-removal ha restituito lo stato di errore 10
  UpgradeStatus: Upgraded to oneiric on 2011-06-27 (5 days ago)

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