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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
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You're going to have to erase that drive and partition - format it properly. You can't use Master Boot Record as the scheme, it has to be GUID.

Backup what you can first, then boot with your install recovery DVD and erase the drive. You should be able to remove the Ubuntu partition when booted from the DVD. Also, you might have to do a PRAM reset which sometimes is required after setting up a Linux partition. (GRUB messes with the OS X boot sector.)
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