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macbook pro - I installed rEFIND Boot Manager, got mysterious Legacy OS thing that doesn't work - Ask Different
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Howto: Make multiboot installation USB stick – Mountain Lion, Fedora 17, Windows 8, rEFInd, … | Manoranjan's Tech blog
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dual boot - Issue on booting from rEFInd using USB -- make sure you have the latest firmware update installed - Ask Ubuntu
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MacBook Pro — Dual boot Windows 10 and Ubuntu from an external USB Drive | by superkhung | tradahacking
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