package postgresql-9.4 9.4.5-0ubuntu0.15.04 failed to install/upgrade: subprocess installed post-removal script returned error exit status 2

[Amol Baheti]

Could not connect with postgres

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: postgresql-9.4 9.4.5-0ubuntu0.15.04
ProcVersionSignature: Ubuntu 3.19.0-59.66-generic 3.19.8-ckt19
Uname: Linux 3.19.0-59-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.8
AptOrdering:
 postgresql-contrib: Purge
 postgresql-contrib-9.4: Purge
 postgresql-9.4: Purge
 postgresql-common: Purge
 NULL: ConfigurePending
Architecture: amd64
Date: Fri Apr 28 14:33:34 2017
DuplicateSignature: package:postgresql-9.4:9.4.5-0ubuntu0.15.04:subprocess installed post-removal script returned error exit status 2
ErrorMessage: subprocess installed post-removal script returned error exit status 2
InstallationDate: Installed on 2016-03-21 (402 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1.1
 apt 1.0.9.7ubuntu4.2
SourcePackage: postgresql-9.4
Title: package postgresql-9.4 9.4.5-0ubuntu0.15.04 failed to install/upgrade: subprocess installed post-removal script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)