[racket] Installing DrRacket on Chromebook

I've got a student trying to install DrRacket on a Chromebook. She has
Ubuntu installed, but we can't tell what version because

lsb_release -a

Gives:

bash: lsb_release: command not found

We tried the instructions at

http://linuxg.net/how-to-install-drracket-on-ubuntu-12-04-ubuntu-12-10-and-ubuntu-13-04-by-the-command-line-interface/

But these failed because the echo "deb... commands came back with:

bash: /etc/apt/sources.list: No such file or directory

Does anyone know how to do this?

-- 
Peter Drake
https://sites.google.com/a/lclark.edu/drake/
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