package libpam-systemd:amd64 204-5ubuntu20.15 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255

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ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libpam-systemd:amd64 204-5ubuntu20.15
ProcVersionSignature: Ubuntu 3.16.0-50.67~14.04.1-generic 3.16.7-ckt16
Uname: Linux 3.16.0-50-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Thu Feb 4 17:44:34 2016
DpkgTerminalLog: Log started: 2016-02-04 17:40:31
ErrorMessage: subprocess installed post-installation script returned error exit status 255
InstallationDate: Installed on 2015-04-23 (287 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.11
SourcePackage: systemd
Title: package libpam-systemd:amd64 204-5ubuntu20.15 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)