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If you are using Ubuntu or any other derivative (like Trisquel GNU/Linux , the best way to install Psychosynth is to add the repository to your sources list. To add your repository you may do it graphically using Synaptic or just edit this file as root: /etc/apt/sources.list. There are repositories available for the following distributions:

Ubuntu Lucid/Maverick

Easy setup

$> sudo apt-add-repository ppa:gnu-psychosynth-team/ppa
$> sudo apt-get update
$> sudo apt-get install psychosynth-gui psychosynth-samples 

Manual setup

In case you maintain manually your sources.list, here you have the detailed manual setup instructions.

deb https://launchpad.net/~gnu-psychosynth-team/+archive/ppa lucid main
deb-src https://launchpad.net/~gnu-psychosynth-team/+archive/ppa lucid main

Where it says lucid you may also write a later version of the Ubuntu distribution (e.g maverick). You may need to tell apt to accept those repos without issuing a warning when running apt-get update. For that, you can just do the following for each warned key:

$> gpg --keyserver subkeys.pgp.net --recv 4A3B72F02ADA7053
$> gpg --export --armor 4A3B72F02ADA7053 | sudo apt-key add - 

Once you run sudo apt-get update, install the packages:

$> sudo apt-get update
$> sudo apt-get install psychosynth-gui psychosynth-samples 

Many thanks to Aleksander Morgado for maintaining these packages.