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>
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https://bugs.launchpad.net/bugs/1572659
Title:
bcmwl driver does not work with kernel 4.4.0-21 when secure boot
enabled
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