package python3-pkg-resources 12.2-1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting configuration

[Phil Brown]

Failed after 15.04 upgrade.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: python3-pkg-resources 12.2-1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Mon May 18 17:46:22 2015
Dependencies:

DuplicateSignature: package:python3-pkg-resources:12.2-1:package is in a very bad inconsistent state; you should reinstall it before attempting configuration
ErrorMessage: package is in a very bad inconsistent state; you should reinstall it before attempting configuration
InstallationDate: Installed on 2015-03-20 (59 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt 1.0.9.7ubuntu4
SourcePackage: python-setuptools
Title: package python3-pkg-resources 12.2-1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting configuration
UpgradeStatus: Upgraded to vivid on 2015-04-27 (21 days ago)