Just a friendly reminder that anyone attempting to install Ruby gems for Mongrel, ruby-debug-ide, or anything else that needs to build native extensions will need to install build-essential and ruby1.8-dev Ubuntu packages into their (K)Ubuntu Linux system prior to installing the gems. Seems like an easy thing to remember, but I didn't, and ended up wasting a lot of time dorking around with it.
$ sudo apt-get install build-essential ruby1.8-dev
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