cannot use all features of a logitech mouse in KDE

[SmokyMcPot]

Binary package hint: kdebase-runtime

I use a Logitech Cordless Optical TrackMan with Kubuntu 11.04 (64 Bit; KDE 4.6.2). When it is connected, I have an additional tab (named with the name of my mouse) in kcontrol's mouse options, telling:

Sie haben eine Logitech-Maus angeschlossen, und libusb wurde bei der Kompilierung dieser Module erkannt. Es ist aber kein Zugriff auf diese Maus möglich. Die Ursache dafür ist wahrscheinlich ein Rechte-Problem. Bitte ziehen Sie die Dokumentation zu Rate, um das Problem zu lösen.

To translate this in English, it says that I connected a logitech mouse and libusb was detected when compiling the modules. However, I don't have access to the mouse, which might be an access rights problem.

At http://wiki.ubuntuusers.de/Logitech#KDE-Konfiguration I found a hint, telling that one has to do:
Code:
sudo chgrp plugdev /etc/hotplug/logitechmouse*
sudo /etc/init.d/hotplug force-reload
However, there is no such directory, as Kubuntu 11.04 or the used KDE version is not using hotplug anymore, but something else.

kdebase-runtime:
  Installiert: 4:4.6.2-0ubuntu1
  Kandidat: 4:4.6.2-0ubuntu1
  Versionstabelle:
 *** 4:4.6.2-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: kdebase-runtime 4:4.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue May 3 19:12:03 2011
ExecutablePath: /usr/bin/kcmshell4
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: kdebase-runtime
UpgradeStatus: Upgraded to natty on 2011-04-30 (3 days ago)
XsessionErrors:
 (knotify4:1859): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed
 (digikam:3119): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed