package samba4 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Niessen]

I am a still a beginner in working with linux, after having a lot of problems with windows my brother and father persuaded me to install ubuntu. I have to say that I am very positive about ubuntu it works far much better than windows. But it takes a lot of time to get used to a different kind of OS. I started to get this error a few months ago, with updating via de update manager. Now I tried to re-install it but with my lack of knowledge I did not succeed in getting rid of the error. So if someone knows a solution I would love to hear it.

Thanks in advance!

ubuntu 11.04
samba4:
  Installed: 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1
  Candidate: 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1
  Version table:
 *** 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ natty/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: samba4 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-10.44-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic i686
Architecture: i386
Date: Wed Jun 22 14:04:25 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
SourcePackage: samba4
Title: package samba4 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to natty on 2011-05-02 (51 days ago)