在我的笔记本电脑（戴尔 XPS-9343）上启动 Ubuntu 20.04 时，我的鼠标（Logitech MX Anywhere 2）连接成功 - 日志中只有几个警告（ bt_uhid_send: Invalid argument (22) ）。
当我还连接到耳机（Sony WH-1000XM3）时，麻烦就开始了。我必须多次连接/断开鼠标和耳机，直到它最终工作。
Ubuntu 的安装是全新安装 - 在我认为从 Ubuntu 16.04 升级时出现问题之后。
有人对此有所了解，或者这是否也发生在其他人身上？
由于我已经升级了 Ubuntu 18.04（以及之后升级到 18.10），我遇到了蓝牙连接问题。例如，我的蓝牙扬声器播放的音乐严重滞后。经过调查dmesg，我遇到了很多这些错误：
Bluetooth: hci0: last event is not cmd complete (0x0f)
我尝试bluez通过官方 PPA 更新（5.48 -> 5.50），但这没有成功。
输出自lsusb | grep Blue
Bus 006 Device 003: ID 0930:0508 Toshiba Corp. Integrated Bluetooth HCI
奇怪的是，执行时我有 2 个蓝牙设备列表rfkill list
0: Toshiba Bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
的输出dmesg | egrep -i 'blue|firm'可能表明固件存在一些问题：
[ 0.069143] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 18.813225] toshiba_bluetooth: Toshiba ACPI Bluetooth device driver
[ 19.651213] iwl4965 0000:01:00.0: loaded firmware version 228.61.2.24
[ 55.834864] iwl4965 0000:01:00.0: Enabling power save might cause firmware crashes
[ 1204.278716] Bluetooth: Core ver 2.22
[ 1204.278758] Bluetooth: HCI device and connection manager initialized
[ 1204.278764] Bluetooth: HCI socket layer initialized
[ 1204.278771] Bluetooth: L2CAP socket layer initialized
[ 1204.278783] Bluetooth: SCO socket layer initialized
[ 1204.664153] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 1204.664155] Bluetooth: BNEP filters: protocol multicast
[ 1204.664162] Bluetooth: BNEP socket layer initialized
[ 1204.769152] Bluetooth: RFCOMM TTY layer initialized
[ 1204.769161] Bluetooth: RFCOMM socket layer initialized
[ 1204.769172] Bluetooth: RFCOMM ver 1.11
我的内核版本：
4.18.0-10-generic
请问我该如何解决？
我正在尝试在 Ubuntu 16.04 上安装 BlueZ 5.50，因为我需要 MIDI 支持。
我编译并安装如下：
sudo apt-get install libudev-dev
sudo apt-get install libical-dev
sudo apt-get install libreadline-dev
cd bluez-5.50
./configure --enable-midi
make -j8
sudo make install
问题是它不更新/usr/sbin/bluetoothd，这是我重新启动时启动的默认版本。
bluetoothd -v结果，5.37
但./src/bluetoothd -v结果5.50。
路径中唯一的版本似乎是旧版本：
whereis bluetoothd
bluetoothd: /usr/sbin/bluetoothd /usr/share/man/man8/bluetoothd.8.gz
为什么安装脚本保留旧版本？如何将所有内容更新到新版本？我一定要吗？
现在，即使使用旧版本的蓝牙，MIDI BLE 似乎也可以正常工作。
尝试启动 BT 适配器/管理器（默认安装在 Lubu 上）一个小窗口告诉我它不能，因为没有启动 Bluez。
在终端：sudo apt install bluez，它回答：Bluez 已经是新版本（5.46-0ubuntu3）然后邀请我删除几个过时的包。
那么 Bluez Daemon 在哪里启动呢？
写作：systemctl status bluetooth.service ; hcitool dev
回答：
bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset
Active: inactive (dead)
Docs: man:bluetoothd(8)
命令：lspci -k | grep -A3 -i "wireless\|network\|bluetooth"
答案：04:00.0 Ethernet controller: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) (rev 01)
Subsystem: Quanta Microsystems, Inc AR242x / AR542x Wireless Network Adapter (PCI-Express)
Kernel driver in use: ath5k
Kernel modules: ath5k
0f:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
oem@oem-Extensa-5220:~$
我在 Ubuntu 17.10 上使用 bluez v5.46，但无法连接到配对的蓝牙设备。
这是bluetoothctl命令的输出：
$ bluetoothctl
[NEW] Controller 6C:0B:84:27:43:66 tensorFlowPHY [default]
Agent registered
[bluetooth]# scan on
Discovery started
[CHG] Controller 6C:0B:84:27:43:66 Discovering: yes
[NEW] Device FC:58:FA:A1:C2:70 OE-P51
[bluetooth]# pair FC:58:FA:A1:C2:70
Attempting to pair with FC:58:FA:A1:C2:70
[CHG] Device FC:58:FA:A1:C2:70 Connected: yes
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001101-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001108-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110b-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000111e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 ServicesResolved: yes
[CHG] Device FC:58:FA:A1:C2:70 Paired: yes
Pairing successful
[CHG] Device FC:58:FA:A1:C2:70 ServicesResolved: no
[CHG] Device FC:58:FA:A1:C2:70 Connected: no
[CHG] Controller 6C:0B:84:27:43:66 Discoverable: no
[bluetooth]# connect FC:58:FA:A1:C2:70
Attempting to connect to FC:58:FA:A1:C2:70
Failed to connect: org.bluez.Error.Failed
这是更多信息：
$ journalctl -u bluetooth | tail
Mar 29 12:06:01 tensorFlowPHY systemd[1]: Started Bluetooth service.
Mar 29 12:06:01 tensorFlowPHY bluetoothd[1136]: Starting SDP server
Mar 29 12:06:01 tensorFlowPHY bluetoothd[1136]: Bluetooth management interface 1.14 initialized
Mar 29 14:36:12 tensorFlowPHY bluetoothd[1136]: a2dp-sink profile connect failed for FC:58:FA:A1:C2:70: Protocol not available
Mar 29 14:36:59 tensorFlowPHY bluetoothd[1136]: a2dp-sink profile connect failed for FC:58:FA:A1:C2:70: Protocol not available
并systemctl说：
$ systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2018-03-30 16:30:15 CEST; 21s ago
Docs: man:bluetoothd(8)
Main PID: 1492 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
Memory: 1.5M
CPU: 42ms
CGroup: /system.slice/bluetooth.service
└─1492 /usr/lib/bluetooth/bluetoothd
Mar 30 16:30:15 tensorFlowPHY systemd[1]: Starting Bluetooth service...
Mar 30 16:30:15 tensorFlowPHY bluetoothd[1492]: Bluetooth daemon 5.46
Mar 30 16:30:15 tensorFlowPHY systemd[1]: Started Bluetooth service.
Mar 30 16:30:15 tensorFlowPHY bluetoothd[1492]: Starting SDP server
Mar 30 16:30:15 tensorFlowPHY bluetoothd[1492]: Bluetooth management interface 1.14 initialized
Mar 30 16:30:20 tensorFlowPHY bluetoothd[1492]: a2dp-sink profile connect failed for FC:58:FA:A1:C2:70: Protocol not available
Mar 30 16:30:31 tensorFlowPHY bluetoothd[1492]: a2dp-sink profile connect failed for FC:58:FA:A1:C2:70: Protocol not available
编辑 1：我安装了一个缺少的 Ubuntu 软件包：pulseaudio-module-bluetooth并使用以下命令重新启动了 pulseaudio：pulseaudio -k
现在连接试验后蓝牙日志的输出是：
Mar 30 16:36:59 tensorFlowPHY bluetoothd[1492]: Unable to get connect data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Mar 30 16:37:00 tensorFlowPHY bluetoothd[1492]: connect error: Connection refused (111)
Mar 30 16:37:02 tensorFlowPHY bluetoothd[1492]: connect error: Connection refused (111)
知道为什么吗？
编辑 2：我刚刚按照有人要求重新启动了 Ubuntu。仍然有相同的铅。
编辑 3：我已经加载了两个模块/etc/pulse/default.pa：
$ egrep "(policy|discover)" /etc/pulse/default.pa
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
但是我在硬盘上找不到那些，我需要安装其他东西吗？
编辑 4：我的错误，我使用了locate命令。在 a 之后sudo updatedb，该locate命令现在能够找到这两个文件。
编辑 5：这是pactl输出：
$ pactl list modules | grep "Name:"
Name: module-device-restore
Name: module-stream-restore
Name: module-card-restore
Name: module-augment-properties
Name: module-switch-on-port-available
Name: module-udev-detect
Name: module-alsa-card
Name: module-alsa-card
Name: module-bluetooth-policy
Name: module-bluetooth-discover
Name: module-bluez5-discover
Name: module-native-protocol-unix
Name: module-default-device-restore
Name: module-rescue-streams
Name: module-always-sink
Name: module-intended-roles
Name: module-suspend-on-idle
Name: module-console-kit
Name: module-systemd-login
Name: module-position-event-sounds
Name: module-role-cork
Name: module-filter-heuristics
Name: module-filter-apply
Name: module-switch-on-connect
Name: module-x11-publish
Name: module-x11-cork-request
Name: module-x11-xsmp
和dpkg -l输出：
$ dpkg -l | grep blue
ii bluefish 2.2.9-1 amd64 advanced Gtk+ text editor for web and software development
ii bluefish-data 2.2.9-1 all advanced Gtk+ text editor (data)
ii bluefish-plugins 2.2.9-1 amd64 advanced Gtk+ text editor (plugins)
ii blueman 2.0.4-1ubuntu3 amd64 Graphical bluetooth manager
ii bluez 5.46-0ubuntu3 amd64 Bluetooth tools and daemons
ii bluez-cups 5.46-0ubuntu3 amd64 Bluetooth printer driver for CUPS
ii bluez-obexd 5.46-0ubuntu3 amd64 bluez obex daemon
ii bluez-tools 0.2.0~20140808-5build1 amd64 Set of tools to manage Bluetooth devices for linux
ii gnome-bluetooth 3.26.1-1 amd64 GNOME Bluetooth tools
ii indicator-bluetooth 0.0.6+17.10.20170605-0ubuntu3 amd64 System bluetooth indicator.
ii libbluetooth3:amd64 5.46-0ubuntu3 amd64 Library to use the BlueZ Linux Bluetooth stack
ii libgnome-bluetooth13:amd64 3.26.1-1 amd64 GNOME Bluetooth tools - support library
ii pulseaudio-module-bluetooth 1:10.0-2ubuntu3.1 amd64 Bluetooth module for PulseAudio sound server
这是加载的蓝牙脉冲音频模块：
$ pactl list modules short | grep module-bluetooth
9 module-bluetooth-policy
10 module-bluetooth-discover
编辑 6：您的解决方案有效！所以总结一下：
$ bluetoothctl
[bluetooth]# power on
Changing power on succeeded
[CHG] Controller 6C:0B:84:27:43:66 Powered: yes
[bluetooth]# remove FC:58:FA:A1:C2:70
[DEL] Device FC:58:FA:A1:C2:70 OE-P51
Device has been removed
[bluetooth]# exit
Agent unregistered
[DEL] Controller 6C:0B:84:27:43:66 tensorFlowPHY [default]
$ sudo service bluetooth restart
最后：
$ bluetoothctl
[NEW] Controller 6C:0B:84:27:43:66 tensorFlowPHY [default]
Agent registered
[bluetooth]# power on
Changing power on succeeded
[CHG] Controller 6C:0B:84:27:43:66 Powered: yes
[bluetooth]# scan on
Discovery started
[CHG] Controller 6C:0B:84:27:43:66 Discovering: yes
[NEW] Device FC:58:FA:A1:C2:70 OE-P51
[bluetooth]# pair FC:58:FA:A1:C2:70
Attempting to pair with FC:58:FA:A1:C2:70
[CHG] Device FC:58:FA:A1:C2:70 Connected: yes
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001101-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001108-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110b-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000111e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 ServicesResolved: yes
[CHG] Device FC:58:FA:A1:C2:70 Paired: yes
Pairing successful
[CHG] Device FC:58:FA:A1:C2:70 ServicesResolved: no
[CHG] Device FC:58:FA:A1:C2:70 Connected: no
[bluetooth]# connect FC:58:FA:A1:C2:70
Attempting to connect to FC:58:FA:A1:C2:70
[CHG] Device FC:58:FA:A1:C2:70 Connected: yes
Connection successful
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001101-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 00001108-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110b-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110c-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000110e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 UUIDs: 0000111e-0000-1000-8000-00805f9b34fb
[CHG] Device FC:58:FA:A1:C2:70 ServicesResolved: yes
[OE-P51]#
问题：
通过面板控制关闭蓝牙后，蓝牙仍在运行，如下命令所示：
sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since lun. 2018-03-26 10:03:39 CEST; 22min ago
Docs: man:bluetoothd(8)
Main PID: 3713 (bluetoothd)
Status: "Running"
CGroup: /system.slice/bluetooth.service
└─3713 /usr/lib/bluetooth/bluetoothd
下面是附加信息（命令测试、配置）
运行命令测试：
关于官方 ubuntu 蓝牙文档页面，这里是与 bluez 相关的返回：
snap interfaces bluez
Slot Plug
snap interfaces | grep blue
:bluetooth-control -
:bluez -
systemctl status snap.bluez.bluez.service
● snap.bluez.bluez.service
Loaded: not-found (Reason: No such file or directory)
Active: inactive (dead)
类似的讨论
ubuntu 论坛上的类似讨论提出了解决方案，但它们并没有解决我的问题。
版本和内核：
cat /etc/issue
Ubuntu 16.04.4 LTS \n \l
uname -a
Linux dell-vostro1510 4.4.0-67-generic #88-Ubuntu SMP Wed Mar 8 16:34:04 UTC 2017 i686 i686 i686 GNU/Linux
电脑型号及品牌
戴尔 VOSTRO 1510
配置：
lspci -knn | grep Net -A2; lsusb
06:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
Subsystem: Dell Wireless 1395 WLAN Mini-Card [1028:000b]
Kernel driver in use: wl
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0c45:63e0 Microdia Sonix Integrated Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 005: ID 413c:8140 Dell Computer Corp. Wireless 360 Bluetooth
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub