How to burn a DVD on OS X
The easiest way to burn an ISO, the file you need to install Ubuntu from a DVD, is by using Disk Utility. If you’re using an older version of Mac OS X, you might not have the Disk Utility application. In this case, use Disk Copy.
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1
Launch 'Disk Utility' (Applications → Utilities → Disk Utility).
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2
Insert your blank DVD.
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3
Drag and drop your .iso file to the left pane in Disk Utility. Now both the blank disc and the .iso should be listed.
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4
Select the .iso file, and click on the 'Burn' button in the toolbar.
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Ensure that the 'Verify burned data' checkbox is ticked (you may need to click on the disclosure triangle to see the checkbox).
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Click 'Burn'. The data will be burned and verified.
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