I tried almost every suggestion I found to pair my Bluetooth mouse to my laptop(Dell Inspiron 3521 from 2014), I'm running Xubuntu 16.04.06 and I have, I think so,everything installed(blueman,bluez,rfkill,and so on). One suggestion I didn't set was to change the file in /udev/rules.d/bluetooth..../50-bluetooth...!! I don't have this file in this folder. Is this file necessary? If yes, how can I create a bluetooth rule in /rules.d directory? Appreciate some help, Vladi PS.: mouse works flawless with bluetooth dongle.