[ubuntu] Which VNC/remote desktop server?

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http://ubuntuforums.org – I've been reading a lot, but got to no conclusion yet. In the client PC, I installed remmina. On the notebook I want to access remotely what server should I install? This remote notebook is running ubuntu 10.04 still, and I want to view the same desktop as the local user is viewing, in order to solve problems she's facing. The connection must be secure, using ssh tunnel or other method. What options, do I have, what do you recommend? (Hardware)