You are able to transfer files from your computer to your mobile device using bluetooth, but are unable to do it the other way around (Mobile device to computer), you get a "Unable to Connect" or "File sending failed" or some other similar error message and you are puzzled.
Well, the solution is as simple as tweaking a single setting to allow receiving files on your computer using bluetooth. This is disabled by default as a security measure.
Dash homeand type
Personal File Sharing.
Download the official 2buntu app for both Android and Ubuntu Touch.