Comment 4 for bug 1927768

Thanks, it solved my problem.

I installed this package by,

sudo add-apt-repository ppa:blaze/rtbth-dkms
sudo apt-get update
sudo apt-get install rtbth-dkms

And then,

sudo modprobe rtbth

It worked.

Refer https://askubuntu.com/questions/756166/rt3290-ralink-driver-in-ubuntu for more.