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UBUNTU or CentOS
I asked someone at customer support a question about which DVD to order and he recommended that I go with CentOS if I'm planning on getting a job with Linux in the future. So I'm guessing CentOS is an operating system like UBUNTU is an operating system. My question is why don't I see anything about it in the forums below when you can select all the other operating systems to talk about (Kubuntu, Ubuntu, Fedora, Debian, etc.)?