package oss4-gtk (not installed) failed to install/upgrade: trying to overwrite '/usr/share/man/man1/ossxmix.1.gz', which is also in package oss-linux 0:4.2-2003

[Tibo]

Description: Ubuntu 10.04.1 LTS
Release: 10.04

 > apt-cache policy oss4-base
oss4-base:
  Installed: (none)
  Candidate: 4.2-build2002-2
  Version table:
     4.2-build2002-2 0
        500 http://gb.archive.ubuntu.com/ubuntu/ lucid/universe Packages

> apt-cache policy oss4-gtk
oss4-gtk:
  Installed: (none)
  Candidate: 4.2-build2002-2
  Version table:
     4.2-build2002-2 0
        500 http://gb.archive.ubuntu.com/ubuntu/ lucid/universe Packages

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: oss4-gtk (not installed)
ProcVersionSignature: Ubuntu 2.6.32-24.43-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Mon Sep 20 22:45:00 2010
ErrorMessage: trying to overwrite '/usr/share/man/man1/ossxmix.1.gz', which is also in package oss-linux 0:4.2-2003
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
SourcePackage: oss4
Title: package oss4-gtk (not installed) failed to install/upgrade: trying to overwrite '/usr/share/man/man1/ossxmix.1.gz', which is also in package oss-linux 0:4.2-2003