Please test this package and see if it fixes the issue.

http://people.canonical.com/~sforshee/lp1686815/linux-
firmware_1.157.11~pre201704282144_all.deb

Note that I incidentally also updated the 8260 firmware (one of the
commits fixed a problem with both), so if you have any hardware with
8260 bluetooth some testing on that would be appreciated as well.
Thanks!

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

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

** Changed in: linux-firmware (Ubuntu Xenial)
   Importance: Undecided => Medium

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

** Changed in: linux-firmware (Ubuntu Xenial)
     Assignee: (unassigned) => Seth Forshee (sforshee)

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https://bugs.launchpad.net/bugs/1686815

Title:
  Missing Bluetooth firmware for intel 8265 on Ubuntu 16.04

Status in linux-firmware package in Ubuntu:
  Fix Released
Status in linux-firmware source package in Xenial:
  Incomplete

Bug description:
  Bluetooth doesn't work in Ubuntu 16.04 on systems with Intel 8265
  wireless modules that haven't yet had firmware loaded onto them.
  dmesg reports the following:

    Bluetooth: hci0: Direct firmware load for intel/ibt-12-16.sfi failed
  with error -2

  This could be difficult for many people to reproduce, since installing
  a later version of Ubuntu once will load the necessary firmware, which
  will persist through reinstalling the operating system.  So installing
  Ubuntu 17.04 just once, will leave Bluetooth in a working state
  forever.

  I was able to consistently produce the issue on a *brand new* Kabylake
  Meerkat 3.  With Ubuntu 16.04.2, bluetooth didn't work.  I copied the
  ibt-12-16.sfi and ibt-12-16.ddc into /lib/firmware/intel and rebooted.
  After this point, Bluetooth worked (and continued to work after
  reinstalling Ubuntu 16.04.2 and *not* copying the firmware files
  again).

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