@Johan Stenlund, and anyone else stymied, the incantation you are
looking for is:

aptitude forbid-version libusb-0.1-4=2:0.1.12-14ubuntu0

(Or use apt-get's same 'downgrade' feature directly.)

It would also help [me] to remember that /var/log/apt/history.log exists
when trying to recover from a bad update.  (Has anyone thought of having
update-manager create and install local "meta-package" .debs instead of
installing directly for ease of backing out after a SNAFU?  Does apt
even support that?  Belongs on Brainstorm, not in this bug, but I'll
type it here while it's fresh...)

Nice detective work on this one!

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https://bugs.launchpad.net/bugs/595650
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