I think your chip needs to use bcmwl.

Please try to reinstall it:
$ sudo apt purge bcmwl-kernel-source
$ sudo apt install bcmwl-kernel-source

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  WLan not working after Kernel update (HWE)

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Yakkety:
  Won't Fix

Bug description:
  After the update from to newer versions, wifi stopped

  The controller is still found with `lshw -class network`, but wifi is
  not displayed in Network Manager.

  Hardware is Broadcom BCM4331 802.11a/b/g/n.

  What additional informations do you need to resolve this?


  Apple MacBookPro10,2 from ~2012
  elementary OS 0.4 Loki (based on Ubuntu 16.04 LTS) with HWE-Stack
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
   /dev/snd/controlC0:  davidak    2186 F.... pulseaudio
  DistroRelease: elementary 0.4
  HibernationDevice: RESUME=UUID=f8624e3d-378a-4777-8889-1f2f01f83989
  InstallationDate: Installed on 2016-10-26 (188 days ago)
  InstallationMedia: elementary OS 0.4 "Loki" - Stable amd64 (20160909)
   ens9      no wireless extensions.
   docker0   no wireless extensions.
   lo        no wireless extensions.
  MachineType: Apple Inc. MacBookPro10,2
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-20-generic 
root=/dev/mapper/elementary--vg-root ro splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-4.10.0-20-generic N/A
   linux-backports-modules-4.10.0-20-generic  N/A
   linux-firmware                             1.157.8
   0: hci0: Bluetooth
        Soft blocked: yes
        Hard blocked: no
  Tags:  loki loki
  Uname: Linux 4.10.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: docker
  _MarkForUpload: True
  dmi.bios.date: 09/13/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP102.88Z.0106.B0A.1509130955
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-AFD8A9D944EA4843
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-AFD8A9D944EA4843
  dmi.product.name: MacBookPro10,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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