I’m having the same issue - I know the bluetooth adapter is in there because I installed it At the time I was running Mint 18.3 and it worked great! I was able to connect with my wireless headphones no problem.
But I have been experimenting with different distros and was never able to get it working again with new installs - I’ve been through Fedora, Ubuntu, and Mint 19. The bluetooth manager freezes. I tried bluetoothctl just now but the cursor has been blinking on the prompt “waiting to connect to bluetoothd…” for about 10 minutes, no result.
I have also tried uninstalling the native Blueberry package and using Blueman, but that gave me the same result. Is there a next step for resolving this connection error with the bluetooth adapter?
I’m on a Dell Latitude E5530 currently dual booting Ubuntu 18.04 and Mint 19. Thanks!!