package postgresql-contrib-9.5 9.5.5-0ubuntu0.16.04 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 2

[Sudhir Reddy]

Description: Ubuntu 16.04.1 LTS
Release: 16.04

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: postgresql-contrib-9.5 9.5.5-0ubuntu0.16.04
ProcVersionSignature: Ubuntu 4.4.0-51.72-generic 4.4.30
Uname: Linux 4.4.0-51-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
AptOrdering:
 postgresql: Remove
 postgresql-contrib: Remove
 postgresql-contrib-9.5: Remove
 postgresql-9.5: Remove
 NULL: ConfigurePending
Architecture: amd64
Date: Thu Dec 1 18:32:02 2016
DuplicateSignature:
 package:postgresql-contrib-9.5:9.5.5-0ubuntu0.16.04
 Removing postgresql-contrib-9.5 (9.5.5-0ubuntu0.16.04) ...
 update-alternatives: error: alternative path /usr/share/postgresql/9.5/man/man1/postmaster.1.gz doesn't exist
 dpkg: error processing package postgresql-contrib-9.5 (--remove):
  subprocess installed pre-removal script returned error exit status 2
ErrorMessage: subprocess installed pre-removal script returned error exit status 2
InstallationDate: Installed on 2014-11-25 (737 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.15
SourcePackage: postgresql-9.5
Title: package postgresql-contrib-9.5 9.5.5-0ubuntu0.16.04 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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