Comment 184 for bug 1189721

Ubuntu 15.10
4.2.0-30-generic
08:00.1 Bluetooth: Ralink corp. RT3290 Bluetooth

found a driver that supposed to work:
https://github.com/f1u77y/rtbth

i managed to build it and install, but still wont show up in rfkill or hcitool dev

try maybe you will have more luck