I have recently upgraded my system from Ubuntu 18.04 to 20.04. After the upgrade my Bluetooth driver stopped working. Earlier I had made it working in 18.04 following the post RT3290 Ralink driver in Ubuntu. But the same solution is not helping me with 20.04.
I executed the suggested commands and initially it appeared helping by providing a value for hci0
$ sudo modprobe rtbth
$ sudo rfkill unblock bluetooth
$ hcitool dev # check
Devices:
hci0 9C:D2:1E:2A:56:04
But It is not able to find any Bluetooth device from GUI. So I tried the commands from terminal.
$ hcitool scan
Scanning ...
This scanning never ends and does not even find any device while I had enabled my Bluetooth speakers waiting for connection. The same happens for my other Bluetooth devices also.
When I tried the bluetoothctl tool:
$ bluetoothctl
Agent registered
[bluetooth]# agent on
Agent is already registered
[bluetooth]# scan on
[bluetooth]#
Scan on command does not do any thing and returns control to the [bluetooth]# prompt.