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I needed to install FreeNX Server on my wive’s Ubuntu Hardy Heron 8.04.1 LTS X86_64 PC fast.

I opened a Terminal and typed the following:

sudoedit /etc/apt/sources.list

I pasted the following at EOF:

# Launchpad freenx-server
deb http://ppa.launchpad.net/freenx-team/ubuntu hardy main
deb-src http://ppa.launchpad.net/freenx-team/ubuntu hardy main

:wq, then:

sudo apt-get update; sudo apt-get install freenx-server

After that I got a working free-nx server accessible from my windows gaming rig (using nomachine NX client).

References: https://help.ubuntu.com/community/FreeNX