package libpam-modules 1.1.3-6ubuntu1 failed to install/upgrade: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system

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ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libpam-modules 1.1.3-6ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-7.13-generic 3.2.0-rc7
Uname: Linux 3.2.0-7-generic x86_64
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Date: Thu Dec 29 14:08:39 2011
DpkgTerminalLog:
 Unpacking libpam-modules:i386 (from .../libpam-modules_1.1.3-6ubuntu1_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libpam-modules_1.1.3-6ubuntu1_i386.deb (--unpack):
  './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
DuplicateSignature:
 Unpacking libpam-modules:i386 (from .../libpam-modules_1.1.3-6ubuntu1_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libpam-modules_1.1.3-6ubuntu1_i386.deb (--unpack):
  './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
SourcePackage: pam
Title: package libpam-modules 1.1.3-6ubuntu1 failed to install/upgrade: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
UpgradeStatus: No upgrade log present (probably fresh install)