package postfix-mysql 2.11.0-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

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ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: postfix-mysql 2.11.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
Date: Fri Apr 24 17:13:12 2015
DuplicateSignature: package:postfix-mysql:2.11.0-1ubuntu1:subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2015-01-18 (96 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: postfix
Title: package postfix-mysql 2.11.0-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)