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I am trying to install Ubuntu onto a flash drive so I can boot it on any computer. I've done all the tutorials and different ways that I've found, but not luck. The last thing I did was used the tool called unetbootin, but after it installed it informed me that it could not be booted on a Mac.....the other ways I've tried it just screws it up and makes the OS unstable or it doesn't work. For example, I used the Gpartion and the Startup Disk Creator and it wouldn't let me create the startup disk. So I'm not sure what I was doing wrong there. I followed the instructions exactly. Please help me do this. It would be so helpful for me!

I also want it to save what I'm doing on one computer and continue it on another.

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Which OS are you using now? Have you checked the md5sum of the .iso file? –  duxk.gh Apr 27 '13 at 17:04
    
I'm using OS X Mountain Lion. How do you check that? –  Charles Manning Apr 27 '13 at 17:10
    
Open a terminal window (Applications > Utilities > Terminal.app). Type "md5", type a space, drag the iso file into the terminal window (appends command with iso file path), and press Enter. The command line returns the hash number (source). Then compare this hash number with this appropriate one on this list. –  duxk.gh Apr 27 '13 at 17:22
    
You might also want to look into the .iso you're using. I don't have a Mac and don't really know, but there's this: ubuntu-13.04-desktop-amd64+mac.iso. Did you use that one? Look into it before you try it, but that might be worth a shot, too. releases.ubuntu.com/13.04 –  duxk.gh Apr 27 '13 at 17:42
    
It's for this one. b436b6d4c7de064652f30d783bda5b4e ubuntu-12.04.2-desktop-amd64.iso I'm pretty sure I downloaded the Mac one. Although there's one on the list that is for Mac...I went to check again to make sure and when I click download it doesn't give me an option to choose the Mac one. –  Charles Manning Apr 27 '13 at 18:29
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