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adb over usb (Ubuntu host machine)

Hardware: AM335x Sitara development kit

Software Platforms:

  1. Window 7 (Host Machine)
  2. Virtual Box (VM)
  3. Ubuntu 12.04 LTS (Guest OS)

I have followed the TI-Android-JB developer guide sections adb over USB but I am unable to get the results as mentions.
  1. When I perform an "adb devices" on the target machine I get only "List of device attached" no devices.
  2.  When I perform an "adb devices" of the host machine I get "List of device attached" "?????? no permission". I also executed the command as sudo.
Any thoughts