package bcmwl-kernel-source 5.100.82.38 bdcom-0ubuntu3.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[Rita]

wireless internet is not possible; package install generates this error message; Description: Ubuntu 11.04
Release: 11.04; bcmwl-kernel-source:
  Installed: 5.100.82.38+bdcom-0ubuntu3.1
  Candidate: 5.100.82.38+bdcom-0ubuntu3.1
  Version table:
 *** 5.100.82.38+bdcom-0ubuntu3.1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ natty-proposed/restricted i386 Packages
        100 /var/lib/dpkg/status
     5.100.82.38+bdcom-0ubuntu3 0
        500 cdrom://Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)/ kubuntu/dists/natty/restricted/binary-i386/ Packages
        500 cdrom://Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)/ natty/restricted i386 Packages
        500 cdrom://Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)/ xubuntu/dists/natty/restricted/binary-i386/ Packages
        500 http://nl.archive.ubuntu.com/ubuntu/ natty/restricted i386 Packages
     5.60.48.36+bdcom-0ubuntu3 0
        500 cdrom://Ubuntu 10.04.1 LTS _Lucid Lynx_ - Release i386 (20100816.1)/ lucid/restricted i386 Packages

I expect to have wireless internetconnection and flawless packageinstallations; as it is I have to use a LANcable instead and I get the same error message every time.
Thank you.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: bcmwl-kernel-source 5.100.82.38+bdcom-0ubuntu3.1
ProcVersionSignature: Ubuntu 2.6.38-10.44-generic-pae 2.6.38.7
Uname: Linux 2.6.38-10-generic-pae i686
NonfreeKernelModules: wl
Architecture: i386
Date: Tue Jun 7 15:29:50 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
SourcePackage: bcmwl
Title: package bcmwl-kernel-source 5.100.82.38+bdcom-0ubuntu3.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: Upgraded to natty on 2011-05-04 (33 days ago)