package inn2 2.5.4-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[sethdjones]

This package fails every time I try to update the system (sudo apt-get update). So far it has not interfered with launching anything, as far as I know. I am running UbuntuMate 15.04.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: inn2 2.5.4-3
ProcVersionSignature: Ubuntu 3.19.0-51.58-generic 3.19.8-ckt13
Uname: Linux 3.19.0-51-generic i686
ApportVersion: 2.17.2-0ubuntu1.8
Architecture: i386
Date: Tue Mar 1 10:32:01 2016
DpkgHistoryLog:
 Start-Date: 2016-03-01 10:30:59
 Commandline: aptdaemon role='role-commit-packages' sender=':1.57'
 Install: linux-headers-3.19.0-51:i386 (3.19.0-51.58), linux-image-3.19.0-51-generic:i386 (3.19.0-51.58), linux-headers-3.19.0-51-generic:i386 (3.19.0-51.58), linux-image-extra-3.19.0-51-generic:i386 (3.19.0-51.58)
 Upgrade: linux-generic:i386 (3.19.0.49.48, 3.19.0.51.50), linux-image-generic:i386 (3.19.0.49.48, 3.19.0.51.50), linux-headers-generic:i386 (3.19.0.49.48, 3.19.0.51.50)
DuplicateSignature: package:inn2:2.5.4-3:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-05-26 (280 days ago)
InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release i386 (20150422.1)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1.1
 apt 1.0.9.7ubuntu4.2
SourcePackage: inn2
Title: package inn2 2.5.4-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

[Expired for inn2 (Ubuntu) because there has been no activity for 60 days.]