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Possible Duplicate:
How do I get my Mac to boot from an Ubuntu USB key?

I followed the step by step instructions set forth here but none of my macs (all intel) will recognize the stick as bootable

diskutil list shows the following

/dev/disk7 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *4.0 GB disk7 1: 0x17 735.3 MB disk7s1

thoughts or help or are the instructions just plain wrong

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marked as duplicate by Bruno Pereira May 13 '12 at 16:29

This question was marked as an exact duplicate of an existing question.

You might have already looked at this, but if not: – Sun Dial May 9 '12 at 16:07
Duplicate of – Chan-Ho Suh May 13 '12 at 10:04
Definitevely not a duplicate, the linked question is much broader, while this one address a specific technical error happening while following procedures (described in linked question!) – FabienAndre Sep 14 '12 at 9:47

Try reformatting the USB key to HFS+ in Disk Utility and making the (only) partition GUID, which is what the Mac expects of any bootable drive.

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