[Bug 1547920] Re: package lightdm 1.16.7-0ubuntu1 failed to install/upgrade: package lightdm is already installed and configured

[dino99]

*** This bug is a duplicate of bug 1407757 ***
    https://bugs.launchpad.net/bugs/1407757

** This bug has been marked a duplicate of bug 1407757
   multi-arch packages cannot be installed due to dpkg wrongly detecting them as already installed

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https://bugs.launchpad.net/bugs/1547920

Title:
  package lightdm 1.16.7-0ubuntu1 failed to install/upgrade: package
  lightdm is already installed and configured

Status in dpkg package in Ubuntu:
  New

Bug description:
  When I have tried to unninstall dropbox this error has appeared.

  ProblemType: Package
  DistroRelease: Ubuntu 15.10
  Package: lightdm 1.16.7-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
  Architecture: amd64
  Date: Sat Feb 20 18:24:27 2016
  DuplicateSignature: package:lightdm:1.16.7-0ubuntu1:package lightdm is already installed and configured
  ErrorMessage: package lightdm is already installed and configured
  InstallationDate: Installed on 2014-05-31 (629 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  RelatedPackageVersions:
   dpkg 1.18.2ubuntu5.1
   apt  1.0.10.2ubuntu1
  SourcePackage: dpkg
  Title: package lightdm 1.16.7-0ubuntu1 failed to install/upgrade: package lightdm is already installed and configured
  UpgradeStatus: Upgraded to wily on 2015-12-31 (51 days ago)

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