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I figured it out :-) The problem was a old attempt to install ros from sources with pip and easy_install as it is described on http://www.ros.org/wiki/fuerte/Installation/Ubuntu/Source . The attempt places stuff under /usr/local/bin and since I was executing some of the commands with sudo the rights we set to root only. Installing the fuerte ros based on the ppa worked well but old binaries under /usr/local/bin where already placed within the search path before the others and executed instead. This leaded to the permission problems.

The solution was to remove: do delete the related old stuff

cd /usr/local/bin
rm -rf pip pip-2.7 rosco rosdep rosdep-gbp-brew rosdep-source rosinstall roslocate rosversion rosws virtualenv
cd /usr/local/lib
rm -rf python2.7 
# sudo apt-get purge python-pip python-dev build-essential # should not be nessesary but I dit it anyway
sudo apt-get install ros-fuerte-desktop

Greetings