Copy/Paste (Clipboard like) functionality from a VNC desktop
This should work if you've got vncconfig running as a VNC client application. The man page clearly states that it is required for X clipboard support, so make sure that ~/.vnc/xstartup on the server side contains the following line somewhere:
vncconfig -iconic &
to ensure it's started automatically. If you already have a running VNC session without an active instance of vncconfig, just open a terminal on your VNC desktop and start it manually.