Can you install the cups-dbg package and then run

ulimit -c unlimited
sudo /usr/lib/cups/backend/usb

"usb" will crash and produce a core file.

Run

sudo gdb -c core /usr/lib/cups/backend/usb

and at the prompt of gdb run

bt

and after that

quit

Please post all the screen output here.

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https://bugs.launchpad.net/bugs/1108719

Title:
  usb crashed with SIGSEGV in opendir()  --  USB ports are in BIOS
  disabled --> cupsd crashes every time

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