title: Kivy - Unable to open device "/dev/input/event7" on Ubuntu, no permission
body: <p>I'm using Ubuntu 16.04 and every time I run any Kivy App (I'm new to both Ubuntu and Kivy), I get the message: </p>
  
  <pre><code>[WARNING] [MTD] Unable to open device "/dev/input/event7". Please ensure you have the appropriate permissions. 
  </code></pre>
  
  <p>It works normally, I would just like to know why the message appears and if I can get rid of it. It doesn't matter if I run the app from PyCharm or Terminal. When I run it in Windows, everything is fine without this message.</p>