package libpam-modules failed to upgrade on 11.10 distribution upgrade

package libpam-modules 1.1.3-2ubuntu1 failed to install/upgrade:
ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system

Bug has been appeared on upgrade from 11.04 to 11.10.

Thanks,
Igor

ProblemType: Package
DistroRelease: Ubuntu 11.10
Package: libpam-modules 1.1.3-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Thu Oct 13 21:36:55 2011
ErrorMessage: ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
SourcePackage: pam
Title: package libpam-modules 1.1.3-2ubuntu1 failed to install/upgrade: ErrorMessage: './usr/share/man/man8/pam_shells.8.gz' is different from the same file on the system
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (0 days ago)