Grabbed 'flotilla-offline'.
Everything works so far.
I just need to plug in the dock later on this evening.
Once again, that you both for the pointers and fantastic support.
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For anyone else who has an odd setup like me:
Chromebook running Ubuntu 14.04 with XFCE in a Crouton chroot
Running 'python rockpool.py' launches the ChromeOS browser.
An unexpected surprise, but a nice one.
