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[Bug 804821] Re: gdm fails to remove if gdm is the default display manager (and another dm is installed)

 

The upgrade seems to ask what display manager you want to use but when
choosing LightDM it asks again (in a loop) so I had to choose GDM.

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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:
  Triaged
Status in “gdm” source package in Oneiric:
  Triaged

Bug description:
  TEST CASE:
  1. install gdm and lightdm
  2. Set gdm as default greeter
    $ dpkg-reconfigure gdm
    and select dpkg
  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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