package lightdm 1.6.0-0ubuntu4 failed to install/upgrade: le sous-processus script post-removal installé a retourné une erreur de sortie d'état 1

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after GUI login Light Desktop Manager crash and so turn back to lgin screen

ProblemType: Package
DistroRelease: Ubuntu 13.04
Package: lightdm 1.6.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-35.50-generic 3.8.13.13
Uname: Linux 3.8.0-35-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.5
AptOrdering:
 ubuntu-desktop: Purge
 lightdm-remote-session-uccsconfigure: Purge
 lightdm-remote-session-freerdp: Purge
 lightdm: Purge
Architecture: amd64
Date: Fri Dec 27 19:56:06 2013
DuplicateSignature: package:lightdm:1.6.0-0ubuntu4:le sous-processus script post-removal installé a retourné une erreur de sortie d'état 1
ErrorMessage: le sous-processus script post-removal installé a retourné une erreur de sortie d'état 1
LightdmConfig:
 [SeatDefaults]
 greeter-session=unity-greeter
 user-session=ubuntu
MarkForUpload: True
SourcePackage: lightdm
Title: package lightdm 1.6.0-0ubuntu4 failed to install/upgrade: le sous-processus script post-removal installé a retourné une erreur de sortie d'état 1
UpgradeStatus: Upgraded to raring on 2013-04-26 (245 days ago)