我已经安装了 Ubuntu 18.10，但找不到任何蓝牙设备（我尝试了 5 种不同的蓝牙设备）。
笔记本电脑：联想 X1 Carbon gen.4
调试的有用信息：uname：
$ uname -a
Linux Dm3Ch-X1-Carbon 4.15.0-39-generic #42-Ubuntu SMP Tue Oct 23 15:48:01 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
rfkill：
$rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
5: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
dmesg：
dmesg | egrep -i 'blue|firm'
[ 0.034818] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.094337] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 3.964717] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)
[ 4.589388] psmouse serio2: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 3/3
[ 4.901238] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
[ 4.905368] Bluetooth: Core ver 2.22
[ 4.905383] Bluetooth: HCI device and connection manager initialized
[ 4.905385] Bluetooth: HCI socket layer initialized
[ 4.905387] Bluetooth: L2CAP socket layer initialized
[ 4.905392] Bluetooth: SCO socket layer initialized
[ 4.957049] Bluetooth: hci0: Bootloader revision 0.0 build 2 week 52 2014
[ 4.964050] Bluetooth: hci0: Device revision is 5
[ 4.964052] Bluetooth: hci0: Secure boot is enabled
[ 4.964053] Bluetooth: hci0: OTP lock is enabled
[ 4.964053] Bluetooth: hci0: API lock is enabled
[ 4.964054] Bluetooth: hci0: Debug lock is disabled
[ 4.964055] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 4.967036] Bluetooth: hci0: Found device firmware: intel/ibt-11-5.sfi
[ 4.977402] iwlwifi 0000:04:00.0: loaded firmware version 34.0.1 op_mode iwlmvm
[ 6.356683] Bluetooth: hci0: Waiting for firmware download to complete
[ 6.357017] Bluetooth: hci0: Firmware loaded in 1368037 usecs
[ 6.357054] Bluetooth: hci0: Waiting for device to boot
[ 6.368025] Bluetooth: hci0: Device booted in 10721 usecs
[ 6.368604] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-11-5.ddc
[ 6.372114] Bluetooth: hci0: Applying Intel DDC parameters completed
[ 8.982966] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 8.982967] Bluetooth: BNEP filters: protocol multicast
[ 8.982970] Bluetooth: BNEP socket layer initialized
[ 37.236059] Bluetooth: RFCOMM TTY layer initialized
[ 37.236068] Bluetooth: RFCOMM socket layer initialized
[ 37.236076] Bluetooth: RFCOMM ver 1.11
[ 47.235429] audit: type=1107 audit(1542397111.072:54): pid=762 uid=103 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/" interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" mask="send" name="org.bluez" pid=2616 label="snap.whatsdesk.whatsdesk" peer_pid=906 peer_label="unconfined"
[ 58.527056] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 74.412064] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 90.533392] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 106.414158] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 122.542503] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 138.402049] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 154.528083] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 170.404232] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 186.536074] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 202.404440] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 218.536363] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 234.408117] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 250.533321] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 266.403075] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 282.538309] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 298.406152] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 314.535298] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 330.414096] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 346.528044] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 362.398082] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 378.525068] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 394.404110] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 410.532202] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 426.401457] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 442.524101] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 458.404133] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 474.525138] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 490.402198] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 506.529038] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 522.399041] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 538.525062] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 554.397035] Bluetooth: hci0: last event is not cmd complete (0x0f)
PS 我发现了很多类似的帖子这其中描述了非常相似的问题，其中大多数都说在这个版本的内核上一切都应该正常工作