title: “List of devices attached” is empty on Ubuntu 16.04 using "adb devices"
body: <p>I am unable connect my Android to Ubuntu. </p>
  
  <p>On executing command <code>lsusb</code>. It shows attached device. </p>
  
  <pre><code>Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 003: ID 04ca:0061 Lite-On Technology Corp. 
  Bus 001 Device 002: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
  Bus 001 Device 025: ID 2a70:9011  
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  </code></pre>
  
  <p>And I have created rule using this command.</p>
  
  <pre><code>echo SUBSYSTEM=="usb", ATTR{idVendor}=="2a70", MODE="0666", GROUP="plugdev" | sudo tee /etc/udev/rules.d/51-android-usb.rules
  </code></pre>
  
  <p>And after running  <code>adb devices</code>. It is not showing any attached device. </p>
  
  <p>I have also reinstalled adb tools. Even though it is not working. </p>