Issue remains on 4.8.1. Boot is aborted and displays a rescue prompt.

I'll try going back to 15.10 and see if any kernel versions exhibit the
problem. Are we sure that this is an issue with the kernel and not
another package?

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  MacBook wifi doesn't work (brcmfmac)

Status in linux package in Ubuntu:

Bug description:
  wifi doesn't work at all. Output from dmesg:
  brcmfmac 0000:03:00.0: Direct firmware load for brcm/brcmfmac43602-pcie.txt 
failed with error -2
  brcmf_cfg80211_reg_notifier: not a ISO3166 code

  There is no file brcmfmac43602-pcie.txt anywhere on the system.
  However, /lib/firmware/brcm/brcmfmac43602-pcie.bin does exist.

  Iw reg get outputs:
  sudo iw reg get
  country DK: DFS-ETSI
   (2402 - 2482 @ 40), (N/A, 20), (N/A)
   (5170 - 5250 @ 80), (N/A, 20), (N/A)
   (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS
   (5490 - 5710 @ 160), (N/A, 27), (0 ms), DFS
   (57000 - 66000 @ 2160), (N/A, 40), (N/A)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-28-generic 4.4.0-28.47
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC1:  lars       2010 F.... pulseaudio
   /dev/snd/controlC0:  lars       2010 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Jul 10 19:41:18 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=a45b9984-4de8-49e3-ba57-a98ae560ad61
  InstallationDate: Installed on 2016-01-30 (162 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Apple Inc. MacBookPro12,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed 
root=UUID=d3ba9d27-321b-45cb-99f2-776b10c1dc7a ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (78 days ago) 10/26/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP121.88Z.0167.B15.1510261437 Mac-E43C1C25D4880AD6
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro12,1
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-E43C1C25D4880AD6
dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B15.1510261437:bd10/26/2015:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6: MacBookPro12,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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