title: Insufficient permission when running 'adb shell'
body: <p>I am on Ubuntu 12.04. And I need to use  'adb shell' to connect to my device on linux:</p>
  
  <p>I get Insufficient permission when running 'adb shell'as myself.
  But when I run it as 'root', it works.</p>
  
  <p>How can I fix 'adb shell' so that I don' need to run it as root everytime?</p>