package lightdm 1.4.0-0ubuntu2 failed to install/upgrade: subprocess installed post-removal script returned error exit status 1

[AlpahSystem]

Tried reinstalling lightdm after trying to purge it and getting error(1) both the purge and reinstall failed even tried to purge with synaptic packet mahanger

ProblemType: Package
DistroRelease: Ubuntu 12.10
Package: lightdm 1.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.6.1-0ubuntu6
AptOrdering: lightdm: Purge
Architecture: amd64
Date: Wed Oct 31 04:42:31 2012
ErrorMessage: subprocess installed post-removal script returned error exit status 1
InstallationDate: Installed on 2012-10-26 (4 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: lightdm
Title: package lightdm 1.4.0-0ubuntu2 failed to install/upgrade: subprocess installed post-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.