I did this:

sudo chmod 666 /dev/bus/usb/*/*
cancel -a
sudo chmod 755 /usr/lib/cups/backend/usb
ps auxwww | grep '^lp '
sudo strace -o /tmp/trace -fv -p 12220

It doesn't work.

** Attachment added: "trace"
   http://launchpadlibrarian.net/24729052/trace

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Printer (HWModel Name) May Not Be Connected
https://bugs.launchpad.net/bugs/348316
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