Great! Thanks for testing.

** Changed in: linux-firmware (Ubuntu)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1745828

Title:
  [rtl8821a] Ubuntu 16.04 can't find any Bluetooth devices

Status in bluez package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in linux-firmware package in Ubuntu:
  Fix Released

Bug description:
  It is ON and VISIBLE in the control panel.  My iPhone can see two
  other devices but it can't see the computer, and the computer  can't
  see anything, even if left searching for tens of minutes.

  The previous answers listed below suggest the following diagnostics

  Bluetooth not working after update
  How can I make my bluetooth works on Ubuntu 16.04?
  Ubuntu 16.04 bluetooth not working (Dell XPS13)
  Bluetooth (Atheros AR3012) not working on Ubuntu 16.04
  Bluetooth not working on Ubuntu 16.04 LTS
  Bluetooth cannot find any devices
  Stuck on a bluetooth problem

  The service seems to be running

  /home >sudo service bluetooth status
  ● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor 
preset
     Active: active (running) since Thu 2018-01-25 09:16:43 GMT; 1h 46min ago
       Docs: man:bluetoothd(8)
   Main PID: 790 (bluetoothd)
     Status: "Running"
     CGroup: /system.slice/bluetooth.service
             └─790 /usr/lib/bluetooth/bluetoothd

  Jan 25 09:18:31 george-CM6330 bluetoothd[790]: Endpoint registered: 
sender=:1.87
  Jan 25 09:18:31 george-CM6330 bluetoothd[790]: Endpoint registered: 
sender=:1.87
  Jan 25 09:18:31 george-CM6330 bluetoothd[790]: RFCOMM server failed for 
Headset
  Jan 25 09:20:32 george-CM6330 bluetoothd[790]: Endpoint registered: 
sender=:1.12
  Jan 25 09:20:32 george-CM6330 bluetoothd[790]: Endpoint registered: 
sender=:1.12
  Jan 25 09:20:32 george-CM6330 bluetoothd[790]: RFCOMM server failed for 
Headset
  Jan 25 09:20:50 george-CM6330 bluetoothd[790]: Endpoint unregistered: 
sender=:1.
  Jan 25 09:20:50 george-CM6330 bluetoothd[790]: Endpoint unregistered: 
sender=:1.
  Jan 25 09:21:01 george-CM6330 bluetoothd[790]: Endpoint unregistered: 
sender=:1.
  Jan 25 09:21:01 george-CM6330 bluetoothd[790]: Endpoint unregistered: 
sender=:1.

  and not blocked

  /home >rfkill list
  0: hci0: Bluetooth
   Soft blocked: no
   Hard blocked: no
  1: phy0: Wireless LAN
   Soft blocked: no
   Hard blocked: no

  I have edited /etc/bluetooth/main.conf to include

  AutoEnable=true

  but I noted that the entire file was commented out.

  The kernel seems reasonably up to date

   >uname -a
  Linux george-CM6330 4.13.0-26-generic #29~16.04.2-Ubuntu SMP Tue Jan 9 
22:00:44 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

  I wonder if I need a device driver, but I have no idea how to find
  out.  The following diagnostics may help some of you knowledgeable
  people find out.

   >hcitool dev
  Devices:
   hci0 24:0A:64:F5:EE:86

  and the output of dmsg is

  >dmesg | grep Blue
  [    2.030855] usb 1-1.4: Product: Bluetooth Radio
  [   13.806355] Bluetooth: Core ver 2.22
  [   13.806369] Bluetooth: HCI device and connection manager initialized
  [   13.806372] Bluetooth: HCI socket layer initialized
  [   13.806373] Bluetooth: L2CAP socket layer initialized
  [   13.806377] Bluetooth: SCO socket layer initialized
  [   13.827384] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000a 
lmp_ver=06 lmp_subver=8821
  [   13.827386] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_config.bin
  [   13.865327] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_fw.bin
  [   13.877382] Bluetooth: hci0: rom_version status=0 version=1
  [   13.877387] Bluetooth: cfg_sz 0, total size 17428
  [   16.550280] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [   16.550281] Bluetooth: BNEP filters: protocol multicast
  [   16.550284] Bluetooth: BNEP socket layer initialized
  [   27.868345] Bluetooth: RFCOMM TTY layer initialized
  [   27.868350] Bluetooth: RFCOMM socket layer initialized
  [   27.868354] Bluetooth: RFCOMM ver 1.11

  and of lsusb is

  >lsusb
  Bus 002 Device 003: ID 046d:c52f Logitech, Inc. Unifying Receiver
  Bus 002 Device 006: ID 04b8:0849 Seiko Epson Corp. Stylus SX205
  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 004 Device 002: ID 04e8:6123 Samsung Electronics Co., Ltd
  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 001 Device 004: ID 13d3:3414 IMC Networks
  Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  Thanking you in anticipation
  ---
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2017-09-06 (145 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: ASUSTeK Computer INC. CM6330_CM6630_CM6730_CM6830_M11AA-8
  Package: linux
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-26-generic 
root=UUID=8520e78a-1bf6-402d-8e84-8fd01b98ffb3 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.13.0-26.29~16.04.2-generic 4.13.13
  Tags:  xenial
  Uname: Linux 4.13.0-26-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/17/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0704
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: CM6330_CM6630_CM6730_CM6830_M11AA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev x.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0704:bd04/17/2013:svnASUSTeKComputerINC.:pnCM6330_CM6630_CM6730_CM6830_M11AA-8:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnCM6330_CM6630_CM6730_CM6830_M11AA:rvrRevx.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: Desktop
  dmi.product.name: CM6330_CM6630_CM6730_CM6830_M11AA-8
  dmi.product.version: System Version
  dmi.sys.vendor: ASUSTeK Computer INC.
  hciconfig:
   hci0:        Type: BR/EDR  Bus: USB
    BD Address: 24:0A:64:F5:EE:86  ACL MTU: 820:8  SCO MTU: 255:16
    UP RUNNING PSCAN ISCAN
    RX bytes:1259 acl:0 sco:0 events:131 errors:0
    TX bytes:22606 acl:0 sco:0 commands:131 errors:0
  mtime.conffile..etc.bluetooth.main.conf: 2018-01-22T14:27:55.611724

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