package lightdm 1.1.4.is.1.1.3-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Amboyguy]

This package installed/updated fine in the Ubuntu 12.04 ( Unity ) but failed in Xubuntu 12.04 ( XFCE ).

Linux amboyguy-HP-Mini 3.2.0-18-generic #28-Ubuntu SMP Fri Mar 2 20:05:41 UTC 2012 i686 i686 i386 GNU/Linux

amboyguy@amboyguy-HP-Mini:~$ lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: lightdm 1.1.4.is.1.1.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.94-0ubuntu2
AptOrdering: lightdm: Configure
Architecture: i386
Date: Tue Mar 6 08:42:56 2012
DpkgTerminalLog:
 Setting up lightdm (1.1.4.is.1.1.3-0ubuntu2) ...
 No such schema 'org.gnome.settings-daemon.peripherals.touchpad'
 dpkg: error processing lightdm (--configure):
  subprocess installed post-installation script returned error exit status 1
DuplicateSignature:
 Setting up lightdm (1.1.4.is.1.1.3-0ubuntu2) ...
 No such schema 'org.gnome.settings-daemon.peripherals.touchpad'
 dpkg: error processing lightdm (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: lightdm
Title: package lightdm 1.1.4.is.1.1.3-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-03-03 (3 days ago)

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #947713, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.