Ubuntu on Mac mini server 2010

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http://ubuntuforums.org – Hi I have Mac mini server 2010 and I want to install Ubuntu 13.04 on this computer. Can you explain to me how to do it, because this computer doesn't have a superdrive. I tried to use a flash drive, but it didn't work and I had errors like "Missing operating system" or "Booting error". (Hardware)