*** xserver-xorg reconfigured and all other things work again *** Using "dpkg-reconfigure --frontend=dialog debconf" and resetting debconf to use the "dialog" default instead of "KDE" (which needs that dpkg has permission to use the X server, which it didn't have for some reason) solved all problems.
Then I ran "dpkg --configure xserver-xorg_6.9.0..." which worked all right! Subsequently I switched to KDE/Synaptic and executed all pending upgrades (and a few more). Thanks to everybody for the help and especially to Kent West (http://lists.debian.org/debian-user/2006/03/msg00673.html) and Olafur Jans Sigurdsson (http://lists.debian.org/debian-user/2006/03/msg00677.html) who presented the simple but significant suggestion to reconfigure debconf to avoid a silly lack-of-permission! In this way one learns, and this shows the importance not to grab the netinstall CD too early! Thanks to all, Tore P.S. I am sorry not being able to read this list daily any longer due to lack of time and mail server resources. But don't hesitate to use my mail address at any time! -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]