package libxml2-dev 2.7.8.dfsg-5.1ubuntu4.1 failed to install/upgrade: './usr/bin/xml2-config' is different from the same file on the system

Installing a lot of packages at the same time so don't know by which one it was required. This is a fresh Ubuntu 12.04 LTS 64-bit install.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libxml2-dev 2.7.8.dfsg-5.1ubuntu4.1
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
Date: Sun Jul 29 20:23:53 2012
ErrorMessage: './usr/bin/xml2-config' is different from the same file on the system
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120425-15:28
SourcePackage: libxml2
Title: package libxml2-dev 2.7.8.dfsg-5.1ubuntu4.1 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)