Comment 3 for bug 1108719

~$ sudo lsusb
unable to initialize libusb: -99

BUT:
~$ sudo dpkg -l | grep 'libusb'
ii libusb-0.1-4 2:0.1.12-20 userspace USB programming library
ii libusb-1.0-0 2:1.0.9~rc3-2ubuntu1 userspace USB programming library
ii libusbmuxd1 1.0.7-2ubuntu0.1 USB multiplexor daemon for iPhone and iPod Touch devices - library

~$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices

--> programm crashes --> apport pops up --> show details -->
--> Ungültiger Problembericht - Konnte Paket oder Quellpaket-Namen nicht bestimmen.
--> apport closes!

I attached the crash report (_usr_lib_cups_backend_usb.0.crash).