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I have Kubuntu, KDE4.2
The problem is this: I can work normally with ctrl+alt+F7 graphical login/session, the default one, but I am unable to have a working desktop in ctrl+alt+F8.
If I switch to it, I can see the list of boot text messages and the last one is:
grep:/usr/lib/kde4/etc/kde4/kdm/kdmrc : no such file or directory
not starting K Display Manager (kdm-kde4); is not the default display manager
Clearly it is some misconfiguration and something is pointing to the wrong file.
Do anyone know where to fix this?
I already tried to configure again kdm as the default manager, no changes.
The X server is running on console 7 and there is no other X running on any other console. Virtual desktops are something else - you should be able to switch desktops with the desktop switcher, which you can find in the corner of the screen (it looks like a mini view of the available desktops).
Virtual desktops are a feature of the window manager (KDE in your case), not the X server, and you can use them if you have many windows open simultaneously and you don't want them all piled up on the same desktop on each other. I often use virtual desktops to run long tasks (like long downloads) on a different desktop than the one where I do work that actually needs me. I'm sure there are more uses...
As for the errors you see in console 8 - they are probably harmless and you can ignore them if everything is working.