My new Ubuntu 18.04 system also having this issue. I am using Wireless
Dual-Band Bluetooth(Intel 8260) PCI-E card from Asus(PCE-AC55BT). No
issues with the wifi, but the bluetooth conrol tools fail to discover

$ cat /proc/cpuinfo | grep -m1 'model name'
model name      : AMD Ryzen 7 1700 Eight-Core Processor

$ lsb_release -rc
Release:        18.04
Codename:       bionic

$ uname -a
Linux soli 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:23:35 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux

$ lspci -nnk|grep -i wire
17:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] 
(rev 3a)
        Subsystem: Intel Corporation Dual Band Wireless-AC 8260 [8086:0010]

$ lsusb                                                                         
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 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ hciconfig -a                                                                  
hci0:   Type: Primary  Bus: USB                                                 
        BD Address: AC:ED:5C:AE:F0:96  ACL MTU: 1021:4  SCO MTU: 96:6
        RX bytes:1544 acl:0 sco:0 events:118 errors:0
        TX bytes:6184 acl:0 sco:0 commands:117 errors:0
        Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
        Link policy: RSWITCH SNIFF 
        Link mode: SLAVE ACCEPT  

$ dmesg | egrep 'Blue|Core'                                                     
[    0.000000] ACPI: Core revision 20170831                                     
[    0.039987] CPU: Processor Core ID: 0
[    0.044000] smpboot: CPU0: AMD Ryzen 7 1700 Eight-Core Processor (family: 
0x17, model: 0x1, stepping: 0x1)                                         
[    3.760967] ip_tables: (C) 2000-2006 Netfilter Core Team                     
[    4.017034] Bluetooth: Core ver 2.22                                         
[    4.017050] Bluetooth: HCI device and connection manager initialized
[    4.017053] Bluetooth: HCI socket layer initialized
[    4.017054] Bluetooth: L2CAP socket layer initialized
[    4.017058] Bluetooth: SCO socket layer initialized
[    4.067680] Bluetooth: hci0: Firmware revision 0.0 build 176 week 45 2017
[    4.563200] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.563201] Bluetooth: BNEP filters: protocol multicast
[    4.563204] Bluetooth: BNEP socket layer initialized
[    6.249296] Bluetooth: RFCOMM TTY layer initialized
[    6.249299] Bluetooth: RFCOMM socket layer initialized
[    6.249302] Bluetooth: RFCOMM ver 1.11
[   25.321876] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1716.408150] Bluetooth: hci0: last event is not cmd complete (0x0f

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  [Intel 6235] Bluetooth: hci0: last event is not cmd complete (0x0f)

Status in Linux:
Status in linux package in Ubuntu:

Bug description:

  [ 3363.056494] Bluetooth: hci0: last event is not cmd complete (0x0f)


  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-9-generic 4.15.0-9.10
  ProcVersionSignature: Ubuntu 4.15.0-9.10-generic 4.15.2
  Uname: Linux 4.15.0-9-generic x86_64
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC0:  caravena   1811 F.... pulseaudio
  CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
  Date: Fri Feb  9 20:35:29 2018
  InstallationDate: Installed on 2017-10-13 (119 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-9-generic 
root=UUID=707d0f89-4b1d-4432-9d50-6058dc4c1ee9 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
   linux-restricted-modules-4.15.0-9-generic N/A
   linux-backports-modules-4.15.0-9-generic  N/A
   linux-firmware                            1.170
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: ChiefRiver System 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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