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I want to install Ubuntu to an external hard disc from my macbook pro 13.3 2012! I have try to and although the installation complete normal. Then when I go to boot from the external disc it doesn't appear! It shows me only the recovery disc, the partition from Windows and the normal partition.

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What you need is setup GRUB, so you can choose between the OSs. Take a look at this question and comment here your results and/or problems. –  Lucio Feb 13 '13 at 18:52

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