Bluetooth isn't working on 16.04 LTS

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

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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