a2enable:command not found on Ubutntu terminal with Tomcat Server in EC2

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http://serverfault.com – I need to do this on Ubuntu LTS 12.04 a2enable sana.default a2enable sana.default.ssl But on entering a2enable I am getting the error I have installed both Apache tomcat in my server On Entering this a2enable sana.default I am getting a2enable:command not found (HowTos)