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Every time I set up a new Ubuntu instance for Ruby development, I run into the same problem. After installing rvm, when I try to install a gem it complains about not being able to find psych for yaml and not finding zlib. I can't seem to get the hang of this. As usual, I found a number of different solutions online, and each of them solved the problem for some people and not for others. FWIW, this is what corrected the problem for me on a fresh instance of Ubuntu 12.10:
sudo apt-get install zlib1g-dev sudo apt-get install libyaml-dev rvm reinstall 1.9.3Maybe this will help you if you're having a similar problem.