package lightdm 1.10.3-0ubuntu2 failed to install/upgrade: sub-processo script post-removal instalado retornou estado de saída de erro 1

[Daniel Teixeira dos Santos]

This began after I installed xubuntu-desktop package and tried to reconfigure lightdm and unity-greeter.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
Uname: Linux 3.13.0-44-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
AptOrdering:
 ubuntu-desktop: Purge
 lightdm: Purge
Architecture: amd64
Date: Wed Jan 28 16:09:01 2015
DuplicateSignature: package:lightdm:1.10.3-0ubuntu2:sub-processo script post-removal instalado retornou estado de saída de erro 1
ErrorMessage: sub-processo script post-removal instalado retornou estado de saída de erro 1
InstallationDate: Installed on 2014-11-25 (65 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
LightdmConfig:
 [Defaults]
 greeter-session=unity-greeter
SourcePackage: lightdm
Title: package lightdm 1.10.3-0ubuntu2 failed to install/upgrade: sub-processo script post-removal instalado retornou estado de saída de erro 1
UpgradeStatus: No upgrade log present (probably fresh install)