The problem is already known and fixed upstream: http://www.cups.org/str.php?L2019 http://www.cups.org/str.php?L2104
The fix will get into Ubuntu with one of the next cupsys packages.
** Changed in: cupsys (Ubuntu)
Importance: Undecided => Low
Status: Unconfirmed => Confirmed
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USB back-channel bug for minolta printer
https://launchpad.net/bugs/83598
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