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I am trying to put Ubuntu on my USB to install it on my MacBook Pro, but after following step 8 of this Ubuntu guide it becomes unreadable and it doesn't show up while rebooting my computer and holding Alt. A message pops up that says "The disk you inserted was not readable by this computer." directly after I finish the 8th step

How do I get my USB to become readable so I can test Ubuntu on my computer?

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What do you mean when you say unreadable? That it is not recognized? You can't see the content of this device any more? –  Lucio Jan 11 '13 at 3:22
    
The disk you inserted was not readable by this computer. It seems like mac can not read ext4.Did you get the error after you logged into your desktop? –  linuxk Jan 11 '13 at 5:45
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If I don't erase and reformat my drive, the message will keep popping up, but the first time it appears is after the 8th step –  user121396 Jan 11 '13 at 15:07
    
I have tried to just boot up my computer with the drive in, while holding alt, but the drive doesn't show up –  user121396 Jan 11 '13 at 15:18
    
A. What is the number version of your MacBook Pro. B. In the popup message did it ask to "initialize" the drive or anything like that. Also a picture of the partition tab of Disk Utility of the drive with the partition highlighted may help. –  Mateo Feb 13 '13 at 1:20
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