Comment 1 for bug 94346

You don't need a VNC server for krfb to function properly. Krfb is used for sharing the session of a local and logged in user. If you want additional remote displays on a machine this package won't help you.

Perhaps this is what you are looking for:
http://ubuntuforums.org/showthread.php?t=122402

Set this bug to invalid, when I was right. Thanks.