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[Richard <rvandieren@xxxxxxxxx>]

Experienced the same. WIFI no longer working after upgrading on Dell XPS
13 9343 to Ubuntu 16.04 LTS.

SecureBoot is enabled (and will remain so)

lspci -nnk | grep 0280 -A2
02:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)
	Subsystem: Dell BCM4352 802.11ac Wireless Network Adapter [1028:0019]
	Kernel modules: bcma, wl

sudo lshw -C network
  *-network UNCLAIMED     
       description: Network controller
       product: BCM4352 802.11ac Wireless Network Adapter
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 03
       <snip>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to bcmwl in Ubuntu.
https://bugs.launchpad.net/bugs/1572659

Title:
  bcmwl driver does not work with kernel 4.4.0-21 when secure boot
  enabled

Status in bcmwl package in Ubuntu:
  Confirmed

Bug description:
  After updating ubuntu 16.04 to latest kernel 4.4.0-21, bcmwl driver
  (package bcmwl-kernel-source) does not load and wifi not work.

  sudo modprobe wl
  modprobe: ERROR: could not insert 'wl': Required key not available

  If I boot with kernel 4.4.0-18 - bcmwl loads normally and wifi works.

  If secure boot disabled - bcmwl loads normally with kernel 4.4.0-21
  and wifi works.

  
  ---
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2015-12-02 (140 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  NonfreeKernelModules: wl
  Package: bcmwl-kernel-source 6.30.223.248+bdcom-0ubuntu8
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-18-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-03-03 (47 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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