我已经安装了 Ubuntu 20.04，但蓝牙对我不起作用。但是如果我从 USB 启动它，它可以在实时会话中工作。有人可以帮我吗？
systemctl | grep -i blue 输出：
sys-devices-pci0000:00-0000:00:14.0-usb1-1\x2d14-1\x2d14:1.0-bluetooth-hci0.device loaded active plugged /sys/devices/pci0000:00/0000:00:14.0/usb1/1-14/1-14:1.0/bluetooth/hci0
sys-subsystem-bluetooth-devices-hci0.device loaded active plugged /sys/subsystem/bluetooth/devices/hci0
bluetooth.service loaded active running Bluetooth service
bluetooth.target loaded active active Bluetooth
dmesg | grep -i blue 输出：
[ 2.309059] Bluetooth: Core ver 2.22
[ 2.309071] Bluetooth: HCI device and connection manager initialized
[ 2.309073] Bluetooth: HCI socket layer initialized
[ 2.309074] Bluetooth: L2CAP socket layer initialized
[ 2.309076] Bluetooth: SCO socket layer initialized
[ 3.413708] Bluetooth: BNEP (Ethernet Emulation) …