package libsane 1.0.22-7ubuntu1 [modified: lib/udev/rules.d/40-libsane.rules] failed to install/upgrade: './lib/udev/rules.d/40-libsane.rules' is different from the same file on the system

[Horne]

I'm using Ubuntu 12.04 LTS and have libsane 1.0.22-7ubuntu1 installed. I've been trying to install skype (skype-ubuntu_2.2.0.35-1_amd64.deb) without success. Every time I try to install the package, I get an error concerning ia32-libs-multiarch:i386 .

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libsane 1.0.22-7ubuntu1 [modified: lib/udev/rules.d/40-libsane.rules]
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu6
AptOrdering:
 libsane: Install
 libsane: Configure
 ia32-libs-multiarch: Configure
 ia32-libs: Configure
Architecture: amd64
Date: Thu Apr 26 12:56:43 2012
DpkgTerminalLog:
 Unpacking libsane:i386 (from .../libsane_1.0.22-7ubuntu1_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libsane_1.0.22-7ubuntu1_i386.deb (--unpack):
  './lib/udev/rules.d/40-libsane.rules' is different from the same file on the system
DuplicateSignature:
 Unpacking libsane:i386 (from .../libsane_1.0.22-7ubuntu1_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libsane_1.0.22-7ubuntu1_i386.deb (--unpack):
  './lib/udev/rules.d/40-libsane.rules' is different from the same file on the system
ErrorMessage: './lib/udev/rules.d/40-libsane.rules' is different from the same file on the system
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
SourcePackage: sane-backends
Title: package libsane 1.0.22-7ubuntu1 [modified: lib/udev/rules.d/40-libsane.rules] failed to install/upgrade: './lib/udev/rules.d/40-libsane.rules' is different from the same file on the system
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.sane.d.dll.conf: 2012-03-16T11:20:42.380392

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #952544, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.