Public bug reported:

I cannot turn on Bluetooth in the settings, and `hcitool dev` doesn't
show devices. Bluetooth used to work before upgrading from 18.04 to
18.10.

lsb_release -rd:
Description:    Ubuntu 18.10
Release:        18.10

apt-cache policy bluez
bluez:
  Installed: 5.50-0ubuntu1
  Candidate: 5.50-0ubuntu1
  Version table:
 *** 5.50-0ubuntu1 500
        500 http://nl.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: bluez 5.50-0ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-17.18-generic 4.18.20
Uname: Linux 4.18.0-17-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr  4 12:08:46 2019
InstallationDate: Installed on 2018-10-26 (159 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
InterestingModules: bnep btusb bluetooth
MachineType: HP HP EliteBook 820 G3
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-17-generic 
root=UUID=c4bb9536-586b-43ea-a9cf-379bad764d8a ro quiet splash
SourcePackage: bluez
UpgradeStatus: Upgraded to cosmic on 2019-03-15 (19 days ago)
dmi.bios.date: 01/30/2018
dmi.bios.vendor: HP
dmi.bios.version: N75 Ver. 01.24
dmi.board.name: 807C
dmi.board.vendor: HP
dmi.board.version: KBC Version 85.77
dmi.chassis.asset.tag: 5CG73148FW
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: 
dmi:bvnHP:bvrN75Ver.01.24:bd01/30/2018:svnHP:pnHPEliteBook820G3:pvr:rvnHP:rn807C:rvrKBCVersion85.77:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP EliteBook
dmi.product.name: HP EliteBook 820 G3
dmi.product.sku: 2SF33EP#ABH
dmi.sys.vendor: HP
hciconfig:
 hci0:  Type: Primary  Bus: USB
        BD Address: 00:00:00:00:00:00  ACL MTU: 0:0  SCO MTU: 0:0
        DOWN 
        RX bytes:0 acl:0 sco:0 events:0 errors:0
        TX bytes:3 acl:0 sco:0 commands:1 errors:0

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1823150

Title:
  Bluetooth cannot be turned on (Bluetooth: hci0: Reading Intel version
  information failed (-110))

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