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I have a MacBook 6,1 with both, OS X and Windows XP partitions. I try to boot from my USB drive which has Ubuntu installed and working (tried on friends computer) and it booted fine.

I try to boot it and it boots into Windows. I am using "rEFIt" and "Live-CD's" work. and USB's and external hard-drives don't seem to.

I tried this guide, and the problem with the answer is, that I am not running a "Live Boot" but an actual install. I took a Live CD and installed Ubuntu onto my flash-drive (32 gig) and I use it as an external hard-drive.

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closed as too localized by qbi, da Boss, Uri Herrera, belacqua, Jorge Castro Feb 28 '13 at 22:51

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Possible duplicate of This answer worked for me: –  Chan-Ho Suh Mar 9 '12 at 4:10
@C S Not at all, I have Ubuntu installed on a USB and all I want to do is boot into the USB. I don't want to use it to install anything. The USB is simply acting as an external hard-drive. EDIT: It's not that it doesn't boot, it does for a second and then instantly switches. –  Sean H Mar 9 '12 at 4:39
The problem, as you stated it, is booting off the USB. In the other thread, the reason for wanting to do so was installing, but it's the same problem: not being able to boot off the USB. I suggest you read the other thread and follow the link I recommended. AFAIK, that (and related methods) is the only way to boot Ubuntu off a USB on a Mac. –  Chan-Ho Suh Mar 9 '12 at 4:41
The USB did boot fine before I had Windows installed...I had to install windows for programming purposes. –  Sean H Mar 9 '12 at 4:50
Guide didn't help, I have no .img to use. –  Sean H Mar 11 '12 at 14:45