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I am looking to download ubuntu on my mac and make a bootable cd or flash drive for a PC with windows 7. how could I do this?
Of course possible! Official Ubuntu page itself has a guide on how to achieve this if you're on a Mac OSX. Please refer below guidelines to do so;
Hope this helps! :)
If for CD, just open your CD burner application and then burn the image (.iso) file.
For flash drive, I couldn't help you out, sorry mate.