Install blueman.
sudo apt install blueman
Install sysfsutils.
sudo apt install sysfsutils
Edit /etc/sysfs.conf, add this line at the end of the file:
/module/bluetooth/parameters/disable_ertm=1
Write the following to file:
sudo -i
echo 1 > /sys/module/bluetooth/parameters/disable_ertm
Restart.
All of the above steps may not be needed. Not sure which one did the trick so I just wrote down all of them.
Open blueman-manager
and add the controller.
References: