Ubuntu Enterprise Cloud and ElasticFox / HybridFox
This is perhaps slightly unfair, but approximately, after following the Example Usage instructions from the Eucalyptus site for a good little while, and re-following, and tweaking, and checking, I had no joy.
I then googled a bit harder and found HybridFox, which worked first time.
Perhaps I could have gotten ElasticFox working. HybridFox meant I didn’t have to try.