package postgresql-common 173 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Terence Mothers]

ubuntu 16.04

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: postgresql-common 173
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Mon Aug 22 10:40:32 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-03-30 (144 days ago)
InstallationMedia: Ubuntu-Server 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: postgresql-common
Title: package postgresql-common 173 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-08-16 (5 days ago)