package libpam-modules 1.1.3-7ubuntu2.1 failed to install/upgrade: './usr/share/man/man8/pam_exec.8.gz' is different from the same file on the system

[constantin]

The following packages have unmet dependencies:

libpam-modules: PreDepends: libc6 (>= 2.14) but 2.15-0ubuntu10.13 is installed
                PreDepends: libselinux1 (>= 2.0.85) but 2.1.0-4.1ubuntu1 is installed
                PreDepends: libpam-modules-bin (= 1.1.3-7ubuntu2.1) but 1.1.3-7ubuntu2.1 is installed
libpam-modules:i386: PreDepends: libc6 (>= 2.8) but 2.15-0ubuntu10.13 is installed
                     PreDepends: libselinux1 (>= 2.0.85) but 2.1.0-4.1ubuntu1 is installed
                     PreDepends: libpam-modules-bin (= 1.1.3-7ubuntu2) but 1.1.3-7ubuntu2.1 is installed

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libpam-modules 1.1.3-7ubuntu2.1
ProcVersionSignature: Ubuntu 3.13.0-83.127~precise1-generic 3.13.11-ckt35
Uname: Linux 3.13.0-83-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.13
Architecture: amd64
Date: Wed Mar 16 20:49:58 2016
DpkgTerminalLog:
 Preparing to replace libpam-modules 1.1.3-7ubuntu2 (using .../libpam-modules_1.1.3-7ubuntu2.1_amd64.deb) ...
 De-configuring libpam-modules:i386 ...
 Unpacking replacement libpam-modules ...
 Preparing to replace libpam-modules:i386 1.1.3-7ubuntu2 (using .../libpam-modules_1.1.3-7ubuntu2.1_i386.deb) ...
 Unpacking replacement libpam-modules:i386 ...
DuplicateSignature: package:libpam-modules:1.1.3-7ubuntu2.1:'./usr/share/man/man8/pam_exec.8.gz' is different from the same file on the system
ErrorMessage: './usr/share/man/man8/pam_exec.8.gz' is different from the same file on the system
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: pam
Title: package libpam-modules 1.1.3-7ubuntu2.1 failed to install/upgrade: './usr/share/man/man8/pam_exec.8.gz' is different from the same file on the system
UpgradeStatus: No upgrade log present (probably fresh install)