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I have removed everything from my macbook pro. Now, how can choose USB as a startup disk? I tried using option "SHIFT" keys also cmd+R. Nothing is working. How can I solve it? I am using Mid 2012 Macbook Pro and that usb is Ubuntu installer. [Btw, I am not interested to install Ubuntu in mac.]

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  • how did you make your bootable ubuntu usb ?
    – enzo
    Oct 26, 2015 at 13:23

2 Answers 2

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The 'option' key at startup will give you the option of selecting another startup disk. The problem may be that your USB stick is not considered a valid startup option.

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Are you able to test if it boots from any other USB bootable source? To test if it's your mac or your Ubuntu installer that is the problem.

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