KDE 4 unable to lock screen or switch user How to Fix

[NekoMiMi Nju]

Hi all:

Running KDE 4 on Kubuntu 7.10 I can not lock the session, nor can I switch 
users. Attempting to lock the session blanks the screen and presents me with 
a dialog that says: Unable to lock the session, reason: No appropriate 
greeter configured. Where do I configure said greeter?

When I attempt to switch users, I get presented with the runner applet. Not 
quite what I had in mind.

thanks

-- chris

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Hey iv'e had this problem 2 just install kdm-kde4 with your package manager ^^
Or just copy to terminal [ sudo apt-get install kdm-kde4 ]