bluetooth.btcommon.BluetoothError: [Errno 2] No such file or directory

参考: https://stackoverflow.com/a/69077661/11842985

Raspberry Pi 4の場合

$ sudo mkdir /etc/systemd/system/bluetooth.service.d/
$ sudo vim /etc/systemd/system/bluetooth.service.d/override.conf

[Service]
ExecStart=
ExecStart=/usr/libexec/bluetooth/bluetoothd -C

$ sudo systemctl daemon-reload
$ sudo systemctl restart bluetooth