Server side (your desktop)For those who don't know what FreeNX is, freeNX is a remote desktop protocol, like VNC. Unlike VNC, FreeNX compresses at the X protocol level, giving it a much better experience over low-bandwidth (and high bandwidth) line. To give you an idea of FreeNX's power, I can use Smooth Scrolling in Firefox over a dial-up line without excessive jerking. Over cable/dsl lines, you can barely notice that you're not actually at the system.
Let's add a line to /etc/apt/sources.list
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deb http://archive.kalyxo.org/ experimental main
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apt-get update
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apt-get install nxserver freenx
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nxsetup --setup-nomachine-key
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nxserver --status
Now make sure you have ssh running
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/etc/init.d/ssh start
Client side
Not much to do here. If it's a windows machine, get the client here http://www.nomachine.com/download_fil2.php?Prod_Id=16 or go here for any other ( I didn't tried any others) http://www.nomachine.com/download.php
You might want to enable SSL in your client.
Conclusion
As a reference, here is the thread http://www.ubuntuforums.org/showthread. ... ght=freenx
Note that I changed the apt source because the one provided in the thread now miss some packages.
Tell me if it works for you, I tried my best but I might have missed a step
Yanik