我对 Ubuntu 20.04（和 Linux）还不熟悉，花了一些时间解决蓝牙无法找到任何设备的问题。
Lubuntu 20.04 未检测到蓝牙设备 不确定，但我认为这最接近我的问题。
dmesg | grep -i 'blue'
[ 4.542033] Bluetooth: Core ver 2.22
[ 4.542054] Bluetooth: HCI device and connection manager initialized
[ 4.542060] Bluetooth: HCI socket layer initialized
[ 4.542074] Bluetooth: L2CAP socket layer initialized
[ 4.542077] Bluetooth: SCO socket layer initialized
[ 4.711132] Bluetooth: hci0: BCM: chip id 70
[ 4.712132] Bluetooth: hci0: BCM: features 0x06
[ 4.728141] Bluetooth: hci0: BCM43142A
[ 4.728145] Bluetooth: hci0: BCM43142A0 (001.001.011) build 0000
[ 4.730896] Bluetooth: hci0: BCM: firmware Patch file not found, tried:
[ 4.730901] Bluetooth: hci0: BCM: 'brcm/BCM43142A0-105b-e065.hcd'
[ 4.730902] Bluetooth: hci0: BCM: 'brcm/BCM-105b-e065.hcd'
[ 6.753354] Bluetooth: hci0: command 0x1003 tx timeout
[ 6.754147] Bluetooth: hci0: unexpected event for opcode 0x1003
[ 7.707035] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7.707037] Bluetooth: BNEP filters: protocol multicast
[ 7.707042] Bluetooth: BNEP socket layer initialized
[ 21.550716] Bluetooth: RFCOMM TTY layer initialized
[ 21.550722] Bluetooth: RFCOMM socket layer initialized
[ 21.550729] Bluetooth: RFCOMM ver 1.11