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gnome-control-center can't start bluetooth-services. how to fix it?

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In Ubuntu 18.04 gnome-control-center, I can't start bluetooth service despite having toggled the "Start Toggle" widget. This was not the case previously. Also, I noticed that whenever I powered-up/start the system, the bluetooth service isn't started up.

$ gnome-control-center --version
gnome-control-center 3.28.2

$ sudo systemctl status bluetooth.service 
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:bluetoothd(8)

$  lsmod | grep blue
bluetooth             544768  5 btrtl,btintel,btbcm,btusb
ecdh_generic           16384  1 bluetooth

$ dmesg | egrep -i 'blue|firm'
[    0.160979] Spectre V2 : Enabling Restricted Speculation for firmware calls
[    0.207242] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[    2.842620] Bluetooth: Core ver 2.22
[    2.842631] Bluetooth: HCI device and connection manager initialized
[    2.842633] Bluetooth: HCI socket layer initialized
[    2.842634] Bluetooth: L2CAP socket layer initialized
[    2.842635] Bluetooth: SCO socket layer initialized
[    2.864929] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-cc-a0-50.ucode failed with error -2
[    2.865028] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-cc-a0-49.ucode failed with error -2
[    2.866772] iwlwifi 0000:02:00.0: loaded firmware version 48.4fa0041f.0 op_mode iwlmvm
[    2.891792] Bluetooth: hci0: Firmware revision 0.0 build 54 week 27 2019
[    2.950353] iwlwifi 0000:02:00.0: Allocated 0x00400000 bytes for firmware monitor.
[    2.958047] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_27.bin (v1.27)
[ 2179.410272] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 2179.410276] Bluetooth: BNEP filters: protocol multicast
[ 2179.410288] Bluetooth: BNEP socket layer initialized
[ 2179.419756] Bluetooth: RFCOMM TTY layer initialized
[ 2179.419760] Bluetooth: RFCOMM socket layer initialized
[ 2179.419762] Bluetooth: RFCOMM ver 1.11

I am able to manually start the bluetooth service via terminal:

$ sudo systemctl start bluetooth.service

The Ubuntu 18.04 gnome-control_center-->Bluetooth-->start-toggle widget seems to be broken. How do I fix this issue?

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