title: Unable to claim USB interface (Device or resource busy)
body: <p>I want to use my ACR122U contact-less smart card reader in Ubuntu 14 smarty. So I installed my required packages and drivers. </p>
  
  <p>Finally when I want to use the reader I receive the following error:</p>
  
  <pre><code>rc@rc-System-Product-Name:~/Desktop/itsme$ sudo nfc-list
  [sudo] password for rc: 
  nfc-list uses libnfc 1.7.0
  error   libnfc.driver.acr122_usb    Unable to claim USB interface (Device or resource busy)
  nfc-list: ERROR: Unable to open NFC device: acr122_usb:001:020
  rc@rc-System-Product-Name:~/Desktop/itsme$ 
  rc@rc-System-Product-Name:~/Desktop/itsme$ sudo mfoc -O output.txt
  error   libnfc.driver.acr122_usb    Unable to claim USB interface (Device or resource busy)
  No NFC device found.
  rc@rc-System-Product-Name:~/Desktop/itsme$ 
  </code></pre>
  
  <p>It seems that my reader is in use with a kernel tool. I searched a lot. there are a lot of people that had the same issue already, but I couldn't find my answer among them. </p>
  
  <p>Does anybody has any idea how I can resolve this problem? (By reclaiming the device, for example)</p>