Hello, bad news
I tried to update as suggested by Philipp using the synaptic command,
but got after a long time of retrieving and installing packages many
errors which I had collected in a reply mail (gnome -but I use kde ...).
In trying to send it it turned out that the KMail was not working
(could not find the mail provider). So I restarted the PC with the
result that it freezes at the login Menu (user, password) and I can
not move the mouse anymore, ctr alt del does not work. I could try to
use a knoppix dvd for recovery, but do not know what to do. So may be
I should ask somebody from the Linux User Group Tuebingen for help.
I am writing this from my notebook.
Wolfgang