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Follow these instructions to install Psychosynth if you are using Ubuntu or any other derivative (like Trisquel GNU/Linux).

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.