This problem has been talked about here in relation to suspend operations but I had a slightly different issue.
When I attempted to logout of a freshly installed Kubuntu 10.04 system I would be treated to a black screen. No ability to shutdown the x-server and I had to manually power off the computer.
The ~/.xsession-error file had some references to knetwork manager which lead me to a solution.
(As posted elsewhere in the forums) This code solved my problem:
Hope this saves someone a couple of days of searching 
When I attempted to logout of a freshly installed Kubuntu 10.04 system I would be treated to a black screen. No ability to shutdown the x-server and I had to manually power off the computer.
The ~/.xsession-error file had some references to knetwork manager which lead me to a solution.
(As posted elsewhere in the forums) This code solved my problem:
Code:
sudo service network-manager stop sudo rm /var/lib/NetworkManager/NetworkManager.state sudo service network-manager start
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