Unfortunately /var/log/installer/syslog is by far the more useful log message, particularly given that you didn't provide the full traceback. If you can't provide that then I'm afraid there is nothing I can do with this bug ... Thanks in advance.
** Changed in: ubiquity (Ubuntu)
Status: Unconfirmed => Needs Info
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Crash installing onto memory stick
https://launchpad.net/bugs/50863
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