package lightdm 1.18.3-0ubuntu1.1 failed to install/upgrade: package lightdm is already installed and configured

[Manish]

package lightdm 1.18.3-0ubuntu1.1 failed to install/upgrade: package lightdm is already installed and configured

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports:
 640:0:116:112682:2017-04-05 20:56:17.670303344 +0530:2017-04-05 20:56:18.670303344 +0530:/var/crash/liblightdm-gobject-1-0:amd64.0.crash
 644:0:116:0:2017-04-05 20:56:20.234316736 +0530:2017-04-05 20:56:20.234316736 +0530:/var/crash/liblightdm-gobject-1-0:amd64.0.upload
 600:0:116:71926:2017-04-05 20:55:10.977714538 +0530:2017-04-05 20:55:11.977714538 +0530:/var/crash/lightdm.0.crash
Date: Wed Apr 5 20:55:12 2017
DuplicateSignature:
 package:lightdm:1.18.3-0ubuntu1.1
 Processing triggers for mime-support (3.59ubuntu1) ...
 dpkg: error processing package lightdm (--configure):
  package lightdm is already installed and configured
ErrorMessage: package lightdm is already installed and configured
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.20
SourcePackage: dpkg
Title: package lightdm 1.18.3-0ubuntu1.1 failed to install/upgrade: package lightdm is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)