Here's what helped to fix this - see your file "/etc/X11/xorg.conf": Section "Input Device" Identifier "Configured Mouse" Driver "mouse" Option "Core Pointer" Option "Device" "/dev/input/mice" Option "Protocol" "Im PS/2" Option "ZAxis Mapping" "4 5" # markus - 07-10-28 ...#Option "Emulate3Buttons" "true" Option "Buttons" "3" # ...
Moreover, it also survived an accidental reboot in the middle of package-installations: While I had the PC run the upgrade process mentioned above, another user switched to their account (leaving mine logged in as usual), not knowing what I was actually in the middle of.
Due to a hardware-problem, I had to switch my previous mainbord Asus M2NPV-VM for a new one: Asus M3N78-VM.
While basically everything is up and running again, I had to play around a bit to get X working again, with the downside of system-lockups if 3D-effects are enabled. Also, the new mainboard does not have a parallel port anymore.
This leaves me with a stable but quite basic desktop now without any of that nice effects-stuff. Thus, I had to connect my HP Desk Jet 5550 printer via USB now.
While this works just fine, every now and then, GNOME's system-config-printer application adds a second "deskjet-5550" printer, for whatever reason.
A problem which has become quite annoying is that after the boot sequence, the mouse sometimes does not work.