You can try previous kernel versions your system had prior to the problem, 
using this technique:
  https://wiki.ubuntu.com/RecoveryMode

No need to select "recovery mode" but other older kernel versions should
still be listed for you to use.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1710941

Title:
  Bluetooth stopped working after update

Status in bluez package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Bluetooth connection to Bose Soundlink II have been fine for years.
  Applied a few new updates in the last day or two --- system was
  generally up to date, I don't often wait more than a week or so ---
  and now I can no longer connect.  Removed the device and re-paired
  just fine, although the speaker did not connect as it usually does
  after the pairing (i.e., it stayed in pairing mode).

  Messages in syslog:

  Aug 15 20:32:07 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:07 n1 bluetoothd[1075]: GLib: Source ID 276 was not found when 
attempting to remove it
  Aug 15 20:32:11 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:42 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:32:42 n1 bluetoothd[1075]: GLib: Source ID 287 was not found when 
attempting to remove it
  Aug 15 20:32:46 n1 bluetoothd[1075]: connect error: Connection refused (111)
  Aug 15 20:33:07 n1 bluetoothd[1075]: connect error: Host is down (112)
  Aug 15 20:33:07 n1 bluetoothd[1075]: GLib: Source ID 305 was not found when 
attempting to remove it

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: bluez 5.37-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
  Uname: Linux 4.4.0-91-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Aug 15 20:34:34 2017
  InstallationDate: Installed on 2015-12-26 (597 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  InterestingModules: rfcomm bnep btusb bluetooth
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-91-generic 
root=UUID=5950fbba-cde1-49ac-a918-04e517894c57 ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: Upgraded to xenial on 2017-02-28 (168 days ago)
  dmi.bios.date: 01/18/2017
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0362.2017.0118.0940
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-504
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0362.2017.0118.0940:bd01/18/2017:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-504:cvn:ct3:cvr:
  hciconfig:
   hci0:        Type: BR/EDR  Bus: USB
        BD Address: DC:53:60:97:55:17  ACL MTU: 1021:5  SCO MTU: 96:6
        UP RUNNING PSCAN 
        RX bytes:6896 acl:46 sco:0 events:294 errors:0
        TX bytes:4254 acl:32 sco:0 commands:156 errors:0
  mtime.conffile..etc.bluetooth.main.conf: 2015-12-29T07:24:08.439240

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