You may consider trying the text install via the alternate iso. I've had issues before of the live CD not being able to partition the drive. It mostly happens in laptops.
The text install has always worked flawless for me... Just a tip -- Installation Error https://launchpad.net/bugs/59850 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
