Have you try burning it at a slow speed (think 4x) ? Don't take this wrong, but I can't see how this is an Ubuntu bugs so I'm afraid I'll have to reject it (you might want to try the forums, IRC or the support tracker on Launchpad). Thanks.
** Changed in: Ubuntu
Status: Unconfirmed => Rejected
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LiveCD does not burn correctly
https://launchpad.net/bugs/68782
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