Could you try pressing Ctrl-Alt-F1 and then Alt-F7 to switch away from X and back? If that lets you proceed, then it's a known bug that I've since fixed.
** Changed in: ubiquity (Ubuntu)
Status: Unconfirmed => Needs Info
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Ubuntu Herd 2 - i386 Desktop CD - Installation Error
https://launchpad.net/bugs/80205
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