Ubuntu 22.04 LTS下Edimax BT8500蓝牙适配器无法连接设备且D-Bus连接失败求助

大家好，我最近在Ubuntu 22.04 LTS系统上尝试连接蓝牙耳机，折腾了好几天还是没搞定，想请各位帮忙看看问题出在哪。

我买了一款Edimax的USB蓝牙适配器BT8500，芯片是rtl8761b，官方说明里说它支持的内核版本范围是2.6.32–5.3，看起来和我的系统应该兼容。我按照官方指引下载了驱动，把相关文件放到了/lib/firmware/目录下，然后重启了系统。

重启后运行hciconfig -a，能看到蓝牙适配器的信息，系统设置里也能显示蓝牙选项，但就是没办法连接任何蓝牙设备。我深入排查后发现，bluetoothd进程无法接入D-Bus，执行/usr/bin/snap run bluez时直接报错：

D-Bus setup failed: Failed to connect to socket /var/run/dbus/system_bus_socket: Permission denied

下面是我收集的一些系统信息，要是需要其他命令输出我也可以补充：

hciconfig -a输出 #

hci0:   Type: Primary  Bus: USB
BD Address: 08:BE:AC:2F:A7:C7  ACL MTU: 1021:6  SCO MTU: 255:12
UP RUNNING
RX bytes:810 acl:0 sco:0 events:64 errors:0
TX bytes:5338 acl:0 sco:0 commands:64 errors:0
Features: 0xff 0xff 0xff 0xfe 0xdb 0xfd 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: PERIPHERAL ACCEPT
Name: 'Edward'
Class: 0x7c0104
Service Classes: Rendering, Capturing, Object Transfer, Audio, Telephony
Device Class: Computer, Desktop workstation
HCI Version: 5.1 (0xa)  Revision: 0x9a9
LMP Version: 5.1 (0xa)  Subversion: 0x8a6b
Manufacturer: Realtek Semiconductor Corporation (93)

systemctl status snap.bluez.bluez.service输出 #

× snap.bluez.bluez.service - Service for snap application bluez.bluez
Loaded: loaded (/etc/systemd/system/snap.bluez.bluez.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2023-02-08 19:28:26 NZDT; 20min ago
Main PID: 1541 (code=exited, status=1/FAILURE)
CPU: 32ms

Feb 08 19:28:26 Edward systemd[1]: snap.bluez.bluez.service: Failed with result 'exit-code'.
Feb 08 19:28:26 Edward bluetoothd[1541]: Unable to get on D-Bus
Feb 08 19:28:26 Edward systemd[1]: snap.bluez.bluez.service: Scheduled restart job, restart counter is at 5.
Feb 08 19:28:26 Edward systemd[1]: Stopped Service for snap application bluez.bluez.
Feb 08 19:28:26 Edward systemd[1]: snap.bluez.bluez.service: Start request repeated too quickly.
Feb 08 19:28:26 Edward systemd[1]: snap.bluez.bluez.service: Failed with result 'exit-code'.
Feb 08 19:28:26 Edward systemd[1]: Failed to start Service for snap application bluez.bluez.

其他相关命令输出 #

neale@Edward:~$ sudo /usr/bin/snap run bluez
D-Bus setup failed: Failed to connect to socket /var/run/dbus/system_bus_socket: Permission denied

neale@Edward:~$ ls -la /var/run/dbus/
total 0
drwxr-xr-x  2 root root  60 Feb  7 22:06 .
drwxr-xr-x 37 root root 960 Feb  8 16:29 ..
srw-rw-rw-  1 root root   0 Feb  7 22:06 system_bus_socket

neale@Edward:~$ ps ax|grep dbus
1020 ?        Ss     0:10 @dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
2207 ?        Ss     0:01 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
2428 ?        S      0:00 /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 11 --address=unix:path=/run/user/1000/at-spi/bus
11785 ?        S      0:00 /usr/lib/cups/notifier/dbus dbus://
11786 ?        S      0:00 /usr/lib/cups/notifier/dbus dbus://
85726 pts/0    S+     0:00 grep --color=auto dbus

neale@Edward:~$ lspci -knn | grep Net -A3; lsusb; dmesg | grep -i blue
00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network Connection (Lewisville) [8086:1502] (rev 06)
DeviceName:  Onboard LAN
Subsystem: Gigabyte Technology Co., Ltd 82579LM Gigabit Network Connection (Lewisville) [1458:e000]
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB controller [0c03]: Intel Corporation C600/X79 series chipset USB2 Enhanced Host Controller #2 [8086:1d2d] (rev 06)
--
04:00.0 Network controller [0280]: Qualcomm Atheros AR9462 Wireless Network Adapter [168c:0034] (rev 01)
Subsystem: Lite-On Communications Inc AR9462 Wireless Network Adapter [11ad:6621]
Kernel driver in use: ath9k
Kernel modules: ath9k
05:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM204 [GeForce GTX 970] [10de:13c2] (rev a1)
--
06:00.0 Ethernet controller [0200]: Intel Corporation 82575EB Gigabit Network Connection [8086:10a7] (rev 02)
Subsystem: Intel Corporation 82575EB Gigabit Network Connection [8086:0000]
Kernel driver in use: igb
Kernel modules: igb
06:00.1 Ethernet controller [0200]: Intel Corporation 82575EB Gigabit Network Connection [8086:10a7] (rev 02)
Subsystem: Intel Corporation 82575EB Gigabit Network Connection [8086:0000]
Kernel driver in use: igb
Kernel modules: igb
08:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168]   (rev 06)
Bus 002 Device 004: ID 1b1c:0c04 Corsair Link Cooling Node
Bus 002 Device 003: ID 7392:c611 Edimax Technology Co., Ltd Edimax    Bluetooth Adapter
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 002: ID 2109:0811 VIA Labs, Inc. Hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
Bus 001 Device 003: ID 125f:a83a A-DATA Technology Co., Ltd. HD330
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
dmesg: read kernel buffer failed: Operation not permitted

2023-02-15 更新 #

我尝试完全卸载了bluez，现在查看bluetooth.service状态如下，虽然服务显示正在运行，但还是有一些错误日志，依旧无法连接设备：

● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2023-02-15 18:35:44 NZDT; 1 day 2h ago
Docs: man:bluetoothd(8)
Main PID: 1034 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 38335)
Memory: 2.2M
CPU: 211ms
CGroup: /system.slice/bluetooth.service
└─1034 /usr/lib/bluetooth/bluetoothd

Feb 16 20:33:23 Edward bluetoothd[1034]: Failed to set mode: Not Supported (0x0c)
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSink/sbc
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSource/sbc
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSink/sbc_xq_453
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSource/sbc_xq_453
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSink/sbc_xq_512
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSource/sbc_xq_512
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSink/sbc_xq_552
Feb 16 20:33:23 Edward bluetoothd[1034]: Endpoint registered: sender=:1.84 path=/MediaEndpoint/A2DPSource/sbc_xq_552
Feb 16 20:33:23 Edward bluetoothd[1034]: src/adv_monitor.c:btd_adv_monitor_power_down() Unexpected NULL   btd_adv_monitor_manager object upon power down

备注：内容来源于stack exchange，提问作者Neale Graham