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I just replaced My 27" Intel iMac (Late 2009) HD. It has no OS on it (WD Blue 1TB) . Do I need to download a certain version of Ubuntu onto my Pendrive?

Do I need a windows or mac OS to install ubuntu? I don't want dual boot, I only want Ubuntu. I've seen the light, I just don't know where I'm going now that I'm there... it's too bright!

Thanks guys, I appreciate it.

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