我有一台华硕 Vivobook，配有以下蓝牙硬件：
Realtek bluetooth usb-2.10<br>
configuration: driver=btusb maxpower=500mA speed=12Mbit/s
我已经安装了以下内容：
ii blueman 2.0.4-1ubuntu2 Graphical bluetooth manager<br>
ii bluez 5.43-0ubuntu1 Bluetooth tools and daemons<br>
ii bluez-obexd 5.43-0ubuntu1 bluez obex daemon<br>
ii bluez-tools 0.2.0~20140808-5build1 Set of tools to manage Bluetooth devices for linux
当我使用 bluetoothctl 尝试配对耳机时，我得到了
[NEW] Controller 58:00:E3:2C:61:5B roland-asus-vivo [default]<br>
[NEW] Device 00:11:22:33:98:DD BTH-068
尝试配对 BTH-068，我得到：
[bluetooth]# pair 00:11:22:33:98:DD<br>
Attempting to pair with 00:11:22:33:98:DD<br>
Failed to pair: org.bluez.Error.ConnectionAttemptFailed
在 /var/log/syslog 中我看不到与蓝牙相关的事件。
我已在 /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf 中注释掉此行
[keyfile]<br>
#unmanaged-devices=*,except:type:wifi,except:type:wwan
当然，重新启动了服务，清除并重新安装了蓝牙、bluez等等，但没有任何区别。
此外，当我允许与我的 Ulefone Metal Android 6 手机配对时，甚至没有检测到该设备......所以不仅仅是耳机没有配对。
~$ sudo lspci -nnk | grep -iA2 net; lsusb; rfkill 列出全部; uname -a; dmesg | egrep -i'blue|firm'
02:00.2 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 06) Subsystem: ASUSTeK Computer Inc. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [1043:200f] Kernel driver in use: r8169 Kernel modules: r8169 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723] Subsystem: Lite-On Communications Inc RTL8723BE PCIe Wireless Network Adapter [11ad:1723] Kernel driver in use: rtl8723be Kernel modules: rtl8723be Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 0bda:b721 Realtek Semiconductor Corp. Bus 001 Device 003: ID 13d3:5a01 IMC Networks Bus 001 Device 006: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse Bus 001 Device 004: ID 413c:2003 Dell Computer Corp. Keyboard Bus 001 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hci0: Bluetooth Soft blocked: no Hard blocked: no Linux roland-asus-vivo 4.10.0-22-generic #24-Ubuntu SMP Mon May 22 17:43:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux [ 0.188318] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored [ 1.309471] [drm] GuC firmware load skipped [ 2.288855] usb 1-8: Product: Bluetooth Radio [ 13.691653] Bluetooth: Core ver 2.22 [ 13.691670] Bluetooth: HCI device and connection manager initialized [ 13.691672] Bluetooth: HCI socket layer initialized [ 13.691675] Bluetooth: L2CAP socket layer initialized [ 13.691680] Bluetooth: SCO socket layer initialized [ 14.084129] rtl8723be: Using firmware rtlwifi/rtl8723befw.bin [ 14.381969] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723 [ 14.381970] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_config.bin [ 14.382614] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2 [ 14.382616] Bluetooth: hci0: Failed to load rtl_bt/rtl8723b_config.bin [ 14.382619] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin [ 14.420969] Bluetooth: hci0: rom_version status=0 version=1 [ 14.420975] Bluetooth: cfg_sz 0, total size 22496 [ 14.530629] Bluetooth: HCI UART driver ver 2.3 [ 14.530631] Bluetooth: HCI UART protocol H4 registered [ 14.530631] Bluetooth: HCI UART protocol BCSP registered [ 14.530632] Bluetooth: HCI UART protocol LL registered [ 14.530633] Bluetooth: HCI UART protocol ATH3K registered [ 14.530633] Bluetooth: HCI UART protocol Three-wire (H5) registered [ 14.530667] Bluetooth: HCI UART protocol Intel registered [ 14.530684] Bluetooth: HCI UART protocol Broadcom registered [ 14.530685] Bluetooth: HCI UART protocol QCA registered [ 14.530686] Bluetooth: HCI UART protocol AG6XX registered [ 14.530687] Bluetooth: HCI UART protocol Marvell registered [ 22.674094] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 22.674095] Bluetooth: BNEP filters: protocol multicast [ 22.674098] Bluetooth: BNEP socket layer initialized [ 44.488376] Bluetooth: RFCOMM TTY layer initialized [ 44.488389] Bluetooth: RFCOMM socket layer initialized [ 44.488399] Bluetooth: RFCOMM ver 1.11
已加载模块：~$ lsmod | grep 8723
rtl8723be 90112 0 btcoexist 53248 1 rtl8723be rtl8723_common 24576 1 rtl8723be rtl_pci 28672 1 rtl8723be rtlwifi 73728 2 rtl_pci,rtl8723be mac80211 782336 3 rtl_pci,rtlwifi,rtl8723be
~$ dmesg | grep -i blue
[ 2.288855] usb 1-8: Product: Bluetooth Radio [ 13.691653] Bluetooth: Core ver 2.22 [ 13.691670] Bluetooth: HCI device and connection manager initialized [ 13.691672] Bluetooth: HCI socket layer initialized [ 13.691675] Bluetooth: L2CAP socket layer initialized [ 13.691680] Bluetooth: SCO socket layer initialized [ 14.381969] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723 [ 14.381970] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_config.bin [ 14.382614] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2 [ 14.382616] Bluetooth: hci0: Failed to load rtl_bt/rtl8723b_config.bin [ 14.382619] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin [ 14.420969] Bluetooth: hci0: rom_version status=0 version=1 [ 14.420975] Bluetooth: cfg_sz 0, total size 22496 [ 14.530629] Bluetooth: HCI UART driver ver 2.3 [ 14.530631] Bluetooth: HCI UART protocol H4 registered [ 14.530631] Bluetooth: HCI UART protocol BCSP registered [ 14.530632] Bluetooth: HCI UART protocol LL registered [ 14.530633] Bluetooth: HCI UART protocol ATH3K registered [ 14.530633] Bluetooth: HCI UART protocol Three-wire (H5) registered [ 14.530667] Bluetooth: HCI UART protocol Intel registered [ 14.530684] Bluetooth: HCI UART protocol Broadcom registered [ 14.530685] Bluetooth: HCI UART protocol QCA registered [ 14.530686] Bluetooth: HCI UART protocol AG6XX registered [ 14.530687] Bluetooth: HCI UART protocol Marvell registered [ 22.674094] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 22.674095] Bluetooth: BNEP filters: protocol multicast [ 22.674098] Bluetooth: BNEP socket layer initialized [ 44.488376] Bluetooth: RFCOMM TTY layer initialized [ 44.488389] Bluetooth: RFCOMM socket layer initialized [ 44.488399] Bluetooth: RFCOMM ver 1.11
更新：当我插入外部蓝牙适配器时，所有设备都很容易配对，所以这似乎是驱动程序问题。
答案1
下载文件并将其复制到/lib/firmware/rtl_bt/rtl8723b_config.bin。
然后重新启动。