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Specifically, it says

/init: line 7: can't open /dev/sdb: no medium found

I'm trying to install Ubuntu 12.10 on my intel iMac. I have 1 Mac partition, 1 FAT32 partition with Windows installed on it, and 2 MS-DOS(FAT) partitions which have nothing on them yet, if that helps. I am using rEFIt

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If you boot with a live CD, can you see the partitions with fdisk -l? –  Ken Jan 23 '13 at 23:19
    
I mistyped, 12.10. Thanks for catching my error –  Chuck Dries Jan 25 '13 at 3:24
    
@Ken how do I go about running commands when the UI won't load. The furthest I have gotten is a dark grey bar at the top (no buttons on it) and a pretty purple background when trying to boot from CD. I should note that I do in fact see these things on my display's native resolution, rather than whatever low res the boot menu shows up in (idk if thats relevant, maybe it will help) –  Chuck Dries Jan 25 '13 at 23:22
    
Oh, I thought you meant this happened during the install itself, not when it was just booting off the CD. –  Ken Jan 30 '13 at 22:28
    
You might try a couple of other distros' live CDs to make sure it's a Linux issue, not one specific to Ubuntu. Also if there's a Mac program that can give you an output like fdisk -l, that would be helpful, but I'm not sure what that Mac app would be. –  Ken Jan 30 '13 at 22:29
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So I haven't found the cause of the problem, but I've discovered that if I boot from a CD, but also insert a bootable usb drive, then just ignore it, the live cd will eventually load the normal interface.

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