package libdbus2.0-cil 0.8.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29

This bug showed up when attempting to intall the Flash Player plugin alternative.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libdbus2.0-cil 0.8.0-1
ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
Uname: Linux 3.13.0-44-generic i686
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: i386
Date: Thu Jan 15 11:42:10 2015
DuplicateSignature: package:libdbus2.0-cil:0.8.0-1:subprocess installed post-installation script returned error exit status 29
ErrorMessage: subprocess installed post-installation script returned error exit status 29
InstallationDate: Installed on 2014-11-08 (67 days ago)
InstallationMedia: Lubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
PackageArchitecture: all
SourcePackage: dbus-sharp
Title: package libdbus2.0-cil 0.8.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29
UpgradeStatus: No upgrade log present (probably fresh install)