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I have Ubuntu 12.04 installed on external USB hard drive.

Can I use that same installation (on same USB HDD) on Macbook Air? Can you give me some advices how to boot it?

Thank you in advance!

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I am familiar with a windows enviroment, when i'm using a a windows computer, I enter the BIOS settings and change the boot sequence so it checks if it can boot from a USB device before it goes to the hard drive. As i have looked online, apparently, there is no BIOS on a Mac, but there is a program called EFI apparently, where you can change the boot order from the hard drive(or solid state drive) being first to making your external hard drive first.
This link is about the boot order changing program, EFI.

This link is somewhat about how to use it.

EDIT: There also was a thing on the apple website that said if you press "c" during start up, it will boot from a bootable CD, DVD, or USB drive. If this works, it might be easier. MORE INFO

Sorry if this was not enough information for you, hopefully it is, but i could not test it out, as i do not have a mac.

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For booting right now I use Grub4Dos, because I have no boot manager on external HDD. What kind of boot manager do I need on Mac? –  user198003 Jun 18 '12 at 6:51
    
There also was a thing on the apple website that said if you press "c" during start up, it will boot from a bootable CD, DVD, or USB drive. If this works, it might be easier. - not related to what you just said, but it might work better –  Quinn Jun 18 '12 at 6:51
    
Yeah, you can configure it to boot from your external hardrive. You just need to change boot sequence. –  BigSack Jun 18 '12 at 7:31
    
ok, but on windows, i need to have vmlinuz and several more files for proper boot of linux on external hdd. what about mac? –  user198003 Jun 18 '12 at 7:43
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Yes, just configure your BIOS to boot from your external drive.

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