ssh-keygen
Send a copy of the public key to an agaric with access to the test server to add it there. Read more about setting up public keys and agent forwarding.
Follow composer instructions on https://github.com/drush-ops/drush (preferred over apt-get or PEAR.)
It's actually called Etherpad Lite but i hate that spelling.
This will be a copy-paste of http://mclear.co.uk/2011/08/01/install-etherpad-lite-on-ubuntu/ except for a few things taken from https://github.com/Pita/etherpad-lite#readme and workarounds when things do not go as planned.
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