These instructions will work, but are vulnerable at time-of-first-use. If you're really paranoid, you should check the signature on the key, and make sure it's signed by key 0326DF47 [email protected], and then make sure that key is the same one I used to sign some piece of email you find from me.
RELEASE=$(lsb_release -sc) (echo "deb http://www.subspacefield.org/packages/ubuntu/ $RELEASE universe"; echo "deb-src http://www.subspacefield.org/packages/ubuntu/ $RELEASE universe") | sudo tee -a /etc/apt/sources.list curl http://www.subspacefield.org/packages/ubuntu/key.gpg | sudo apt-key add - sudo aptitude update