Yes, Ubuntu itself is borked right now, but I'm surprised you're passing the "Check disc for defects" because I'm NOT!
Development releases are always "hit or miss" when it comes to daily images but I also wonder why you had trouble with Ubuntu 12.04 and Xubuntu 12.04. Maybe if you're using a DVD drive you should try a live USB?
I'm particularly concerned because you show the discs passing while I show them failing, and I've even checked using testdrive + virtualbox so I know it's not a burn issue.
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