title: no target device found android studio 2.1.1
body: <p>i'm using <strong>android studio 2.1.1</strong> in ubuntu 14.04.Now my question is,i want to run the program through my phone without emulator. so i chose the target as usb device but whenever i run this,below mentioned error is rasing.</p>
  
  <p><strong>Error running app : No target device found.</strong></p>
  
  <p>i checked my device by using <strong>adb devices</strong> command in terminal.
  adithya@adithya-Lenovo-B460e:~$ adb devices
  <strong>List of devices attached 
  59V8I7HEJJWGGMK7    device</strong></p>
  
  <p>i also tried with selecting of MTP &amp; PTP.but nothing worked out.
  kindly anyone help me to solve this problem..</p>