So, I have `Xubuntu 14.04.4` on an old `Toshiba Lifebook S` laptop. 
I have been using (so far) `Blueman Device Manager 1.23` to manage connection and, honestly, I would not be able to report successful connections.

My `GT-I9195` seemingly connects, but no way I manage to browse its filesystem or send a file (yet - I do accept it when prompted...).
So there's a tough chance the problem lies with my hardware or with Blueman. Anyway, I got this: I have just purchased a bluetooth stereo speaker JBL Charge 2+. My laptop 'sees' it but when pairing asks for a pin code. Neither "0000" nor "1234" work. 

I could find absolutely nothing on this issue on the net - posts on this forum about JBL Charge 2 do not seem to apply, they are quite old, and anyway they have remain unanswered.

Thanks for your help - or thanks for trying.