dpkg fails with status parsing error after upgrade to dpkg 1.16.3

Preparing to replace dpkg 1.16.1.2ubuntu8 (using .../dpkg_1.16.3ubuntu2_amd64.deb) ...
Unpacking replacement dpkg ...
Processing triggers for man-db ...
dpkg: error: parsing file '/var/lib/dpkg/status' near line 18628 package 'libcanberra-gtk-module:i386':
 mixed non-coinstallable and coinstallable package instances present
dpkg-query: error: parsing file '/var/lib/dpkg/status' near line 18628 package 'libcanberra-gtk-module:i386':
 mixed non-coinstallable and coinstallable package instances present
debsums: dpkg-query --admindir=/var/lib/dpkg --showformat=${Package}

${PackageSpec}

${binary:Package}

${Version}

${Status}

${Conffiles}

${Replaces}

 --show failed (exit status 2)
E: Problem executing scripts DPkg::Post-Invoke 'if [ -x /usr/bin/debsums ]; then /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives; fi'

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: dpkg 1.16.3ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.2.3-0ubuntu5
Architecture: amd64
Date: Wed Jun 20 16:59:38 2012
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111007)
ProcEnviron:
 SHELL=/bin/bash
 TERM=screen
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
SourcePackage: dpkg
UpgradeStatus: No upgrade log present (probably fresh install)