The process is well described on the
Ubuntu FreeNX Wiki page, the only difference is that you have to use the following apt sources for Feisty:
#freenx packages
deb http://free.linux.hp.com/~brett/seveas/freenx feisty-seveas freenx
deb-src http://free.linux.hp.com/~brett/seveas/freenx feisty-seveas freenx
After the brief installation procedure (takes no more than 5 minutes) you can connect right away to your linux server.
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