Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) Error in Rails 3.1.0 rails s

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Installing node.js fixed this for me

go to https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager

or run the following commands on your terminal 


sudo apt-get install python-software-properties
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs


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