FAQs/Troubleshooting/Printing/Unable to Open

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Copyright © 2007-2010 Userful Corporation. All rights reserved.
(Updated 2010.01.04)



Q: Why did I receive the message "Unable to open USB device"?


A: There is a communication problem.



With a USB printer, you might get a message like this:

Unable to open USB device "usb:/dev/usb/lp0": No such device

This indicates that the printer is not communicating properly with the computer. Printers occasionally need to be rebooted. Please do the following:

  1. Power off the printer and unplug the USB cable.
  2. Power it on again.
  3. Once the printer finishes its warm-up procedure, reconnect the USB cables.
  4. Try printing again.

If this does not resolve the problem, reboot the Userful Desktop then try printing again. If the problem persists, report the problem to Userful Customer Support.