It\'s a bit wired here.
I have a problem is bluetoothctl always said \"No default controller available\". I found there are many people had same problem with me. But th
Had the same problem. Use: $ sudo bluetoothctl
$ sudo bluetoothctl
Then the controller was found automatically. I also tried https://www.raspberrypi.org/forums/viewtopic.php?t=207025 before. Maybe this effected the solution.