我在装有 Ubuntu 17.10 的 Dell Latitude E7470 上没有蓝牙连接（未找到适配器）。
我阅读了一些相关问题，这对我有帮助。
$ rfkill list all
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
但如果我检查蓝牙状态，它会显示
$ sudo service bluetooth status
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2018-03-02 17:09:12 IST; 7s ago
Docs: man:bluetoothd(8)
Main PID: 4649 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
Memory: 772.0K
CPU: 33ms
CGroup: /system.slice/bluetooth.service
└─4649 /usr/lib/bluetooth/bluetoothd
Mar 02 17:09:12 home-pc systemd[1]: Starting Bluetooth service...
Mar 02 17:09:12 home-pc bluetoothd[4649]: Bluetooth daemon 5.46
Mar 02 17:09:12 home-pc systemd[1]: Started Bluetooth service.
Mar 02 17:09:12 home-pc bluetoothd[4649]: Starting SDP server
Mar 02 17:09:12 home-pc bluetoothd[4649]: Bluetooth management interface 1.14 initialized
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Bus 001 Device 007: ID 413c:301a Dell Computer Corp.
Bus 001 Device 006: ID 413c:2113 Dell Computer Corp.
Bus 001 Device 005: ID 0424:2744 Standard Microsystems Corp.
Bus 001 Device 003: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Bus 001 Device 002: ID 0bda:5686 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ dmesg | grep Blu:
[ 2.975668] Bluetooth: Core ver 2.22
[ 2.975681] Bluetooth: HCI device and connection manager initialized
[ 2.975683] Bluetooth: HCI socket layer initialized
[ 2.975684] Bluetooth: L2CAP socket layer initialized
[ 2.975689] Bluetooth: SCO socket layer initialized
[ 2.999152] Bluetooth: HCI UART driver ver 2.3
[ 2.999153] Bluetooth: HCI UART protocol H4 registered
[ 2.999154] Bluetooth: HCI UART protocol BCSP registered
[ 2.999165] Bluetooth: HCI UART protocol LL registered
[ 2.999166] Bluetooth: HCI UART protocol ATH3K registered
[ 2.999166] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 2.999187] Bluetooth: HCI UART protocol Intel registered
[ 2.999196] Bluetooth: HCI UART protocol Broadcom registered
[ 2.999196] Bluetooth: HCI UART protocol QCA registered
[ 2.999197] Bluetooth: HCI UART protocol AG6XX registered
[ 2.999197] Bluetooth: HCI UART protocol Marvell registered
[ 3.801701] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 3.801703] Bluetooth: BNEP filters: protocol multicast
[ 3.801706] Bluetooth: BNEP socket layer initialized
$ lspci -nnk | grep -iA3 net; lsusb; dmesg | egrep -i 'blue|firm':
00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection I219-LM [8086:156f] (rev 21)
Subsystem: Dell Ethernet Connection I219-LM [1028:06dc]
Kernel driver in use: e1000e
Kernel modules: e1000e
01:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
Subsystem: Intel Corporation Wireless 8260 [8086:0250]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Bus 001 Device 007: ID 413c:301a Dell Computer Corp.
Bus 001 Device 006: ID 413c:2113 Dell Computer Corp.
Bus 001 Device 005: ID 0424:2744 Standard Microsystems Corp.
Bus 001 Device 003: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Bus 001 Device 002: ID 0bda:5686 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[ 0.109491] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 1.880544] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)
[ 2.975668] Bluetooth: Core ver 2.22
[ 2.975681] Bluetooth: HCI device and connection manager initialized
[ 2.975683] Bluetooth: HCI socket layer initialized
[ 2.975684] Bluetooth: L2CAP socket layer initialized
[ 2.975689] Bluetooth: SCO socket layer initialized
[ 2.999152] Bluetooth: HCI UART driver ver 2.3
[ 2.999153] Bluetooth: HCI UART protocol H4 registered
[ 2.999154] Bluetooth: HCI UART protocol BCSP registered
[ 2.999165] Bluetooth: HCI UART protocol LL registered
[ 2.999166] Bluetooth: HCI UART protocol ATH3K registered
[ 2.999166] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 2.999187] Bluetooth: HCI UART protocol Intel registered
[ 2.999196] Bluetooth: HCI UART protocol Broadcom registered
[ 2.999196] Bluetooth: HCI UART protocol QCA registered
[ 2.999197] Bluetooth: HCI UART protocol AG6XX registered
[ 2.999197] Bluetooth: HCI UART protocol Marvell registered
[ 3.069439] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-8000C-33.ucode failed with error -2
[ 3.069547] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error -2
[ 3.074130] iwlwifi 0000:01:00.0: loaded firmware version 31.560484.0 op_mode iwlmvm
[ 3.801701] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 3.801703] Bluetooth: BNEP filters: protocol multicast
[ 3.801706] Bluetooth: BNEP socket layer initialized
我怎样才能让它工作？