package libxml2-dev 2.7.8.dfsg-5.1ubuntu4 failed to install/upgrade: './usr/bin/xml2-config' is different from the same file on the system

 lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libxml2-dev 2.7.8.dfsg-5.1ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Thu May 10 11:05:39 2012
ErrorMessage: './usr/bin/xml2-config' is different from the same file on the system
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: libxml2
Title: package libxml2-dev 2.7.8.dfsg-5.1ubuntu4 failed to install/upgrade: './usr/bin/xml2-config' is different from the same file on the system
UpgradeStatus: No upgrade log present (probably fresh install)