Comment 7 for bug 901215

It's not a solution but more a work around:

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root@k:~# more /etc/modprobe.d/blacklist.conf
# This file lists those modules which we don't want to be loaded by
# alias expansion, usually so some other driver will be loaded for the
# device instead.

blacklist uas
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see http://ubuntuforums.org/showthread.php?t=1782546&page=2