Tried to install Nvidia drivers

[Legrand]

packasub-process /usr/bin/dpkg returned an error code

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: linux-backports-modules-cw-3.4-3.2.0-32-generic (not installed)
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Tue Oct 30 20:13:01 2012
ErrorMessage: tentative de remplacement de « /lib/udev/compat_firmware_32_generic.sh », qui appartient aussi au paquet linux-backports-modules-cw-3.3-3.2.0-32-generic 3.2.0-32.17
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
SourcePackage: linux-backports-modules-3.2.0
Title: package linux-backports-modules-cw-3.4-3.2.0-32-generic (not installed) failed to install/upgrade: tentative de remplacement de « /lib/udev/compat_firmware_32_generic.sh », qui appartient aussi au paquet linux-backports-modules-cw-3.3-3.2.0-32-generic 3.2.0-32.17
UpgradeStatus: No upgrade log present (probably fresh install)