我无法在 Ubuntu 上连接我的 BOSE QC35。我尝试安装/卸载 bluez 并重新启动蓝牙服务，但是当我检查日志时，我看到以下内容：
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7299]: Terminating
May 11 13:50:59 murtuza-XPS-15-9550 systemd[1]: Stopping Bluetooth
service...
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7299]: Stopping SDP
server
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7299]: Exit
May 11 13:50:59 murtuza-XPS-15-9550 NetworkManager[876]: <info>
[1526035859.8496] bluez5: NAP: removed interface 44:1C:A8:E3:88:D4
May 11 13:50:59 murtuza-XPS-15-9550 gnome-shell[1089]: Error setting
property 'Powered' on interface org.bluez.Adapter1:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.136
was not provided by any .service files (g-dbus-error-quark, 2)
May 11 13:50:59 murtuza-XPS-15-9550 gnome-shell[1766]: Error setting
property 'Powered' on interface org.bluez.Adapter1:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.136
was not provided by any .service files (g-dbus-error-quark, 2)
May 11 13:50:59 murtuza-XPS-15-9550 systemd[1]: Stopped Bluetooth
service.
May 11 13:50:59 murtuza-XPS-15-9550 gnome-control-c[2175]: Error
setting property 'DiscoverableTimeout' on interface
org.bluez.Adapter1: GDBus.Error:org.freedesktop.DBus.Error.NoReply:
Message recipient disconnected from message bus without replying (g-
dbus-error-quark,
May 11 13:50:59 murtuza-XPS-15-9550 gnome-control-c[2175]: Error
setting property 'Discoverable' on interface org.bluez.Adapter1:
GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient
disconnected from message bus without replying (g-dbus-error-quark, 4)
May 11 13:50:59 murtuza-XPS-15-9550 systemd[1]: Starting Bluetooth s
ervice...
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7680]: Bluetooth daemon
5.48
May 11 13:50:59 murtuza-XPS-15-9550 systemd[1]: Started Bluetooth
service.
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7680]: Starting SDP
server
May 11 13:50:59 murtuza-XPS-15-9550 dbus-daemon[866]: [system]
Activating via systemd: service name='org.freedesktop.hostname1'
unit='dbus-org.freedesktop.hostname1.service' requested by ':1.153'
(uid=0 pid=7680 comm="/usr/lib/bluetooth/bluetoothd "
label="unconfined")
May 11 13:50:59 murtuza-XPS-15-9550 bluetoothd[7680]: Bluetooth
management interface 1.14 initialized
May 11 13:50:59 murtuza-XPS-15-9550 NetworkManager[876]: <info>
[1526035859.9808] bluez5: NAP: added interface 44:1C:A8:E3:88:D4
May 11 13:50:59 murtuza-XPS-15-9550 systemd[1]: Starting Hostname
Service...
May 11 13:51:00 murtuza-XPS-15-9550 dbus-daemon[866]: [system]
Successfully activated service 'org.freedesktop.hostname1'
May 11 13:51:00 murtuza-XPS-15-9550 systemd[1]: Started Hostname
Service.
May 11 13:51:05 murtuza-XPS-15-9550 kernel: [ 2931.126648] Bluetooth:
hci0: last event is not cmd complete (0x0f)