package lightdm (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 1

[Alfred Monticello]

a

ProblemType: Package
DistroRelease: Ubuntu 13.10
Package: lightdm (not installed)
Uname: Linux 3.10.0-031000rc7-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.10.2-0ubuntu3
Architecture: amd64
Date: Wed Jun 26 19:41:59 2013
DuplicateSignature: package:lightdm:(not installed):subprocess installed post-removal script returned error exit status 1
ErrorMessage: subprocess installed post-removal script returned error exit status 1
InstallationDate: Installed on 2013-05-22 (36 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130518)
MarkForUpload: True
SourcePackage: lightdm
Title: package lightdm (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Gabriele Sani (gabrielesani)]

Happened to me when tried to purge lightdm

[Launchpad Janitor (janitor)]

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