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On my Lenovo Edge-15 running 18.04.5 with kernel 4.15.0-122-generic. Secure Boot was disabled all along. I just noticed one day on boot that the Wi-Fi wasn't working. When I went to the Wi-Fi settings I got "No Wi-Fi adapter found". Could an automatic update have turned something off/broken something?

$ sudo lshw -class network
  *-network UNCLAIMED       
       description: Network controller
       product: BCM4360 802.11ac Wireless Network Adapter
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 03
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:d1100000-d1107fff
$ lspci -vnn | grep Network
02:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:4360] (rev 03)
    Subsystem: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:4360]

and

$ iwconfig
vmnet8    no wireless extensions.

docker0   no wireless extensions.

lo        no wireless extensions.

enp3s0    no wireless extensions.

vmnet1    no wireless extensions.

Is Wi-Fi blocked?

$ rfkill list all
0: ideapad_bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no

Continuing working through Installing Broadcom Wireless Drivers.

$ sudo apt list bcmwl-kernel-source
Listing... Done
bcmwl-kernel-source/bionic-updates,now 6.30.223.271+bdcom-0ubuntu5~18.04.1 amd64 [installed]

Purging that per the instructions. Restarted and still no Wi-Fi.

$ sudo update-pciids
Downloaded daily snapshot dated 2020-10-11 03:15:01

Per the table, for 14e4:4360 I need to install

$ sudo apt install firmware-b43-installer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  b43-fwcutter
The following NEW packages will be installed:
  b43-fwcutter firmware-b43-installer

Rebooting and still no Wi-Fi.

sudo modprobe -r b43
sudo modprobe b43    
sudo rfkill unblock all  

After a comment from chili555

$ sudo modprobe wl
modprobe: FATAL: Module wl not found in directory /lib/modules/4.15.0-122-generic

A quick search of the output suggests this answer https://askubuntu.com/a/811015/334823

$ sudo apt-get install --reinstall linux-headers-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 2 not upgraded.
Need to get 2,544 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 linux-headers-generic amd64 4.15.0.122.109 [2,544 B]
Fetched 2,544 B in 0s (28.8 kB/s)                 
(Reading database ... 442641 files and directories currently installed.)
Preparing to unpack .../linux-headers-generic_4.15.0.122.109_amd64.deb ...
Unpacking linux-headers-generic (4.15.0.122.109) over (4.15.0.122.109) ...
Setting up linux-headers-generic (4.15.0.122.109) ...
$ sudo modprobe wl
modprobe: FATAL: Module wl not found in directory /lib/modules/4.15.0-122-generic

I ran $ sudo apt install --reinstall bcmwl-kernel-source and it got rid of the error from sudo modprobe wl (which now returns nothing). But still no Wi-Fi.

dmesg | grep wl
[   52.474364] wl: loading out-of-tree module taints kernel.
[   52.474369] wl: module license 'MIXED/Proprietary' taints kernel.
[   52.478450] wl: module verification failed: signature and/or required key missing - tainting kernel
[   52.481565] wl driver 6.30.223.271 (r587334) failed with code 1
[   52.481568] ERROR @wl_cfg80211_detach : 
[   52.481569] NULL ndev->ieee80211ptr, unable to deref wl1

After searching that 2nd line of output I found https://askubuntu.com/a/261934/334823, which I tried, but no change so reverted.

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  • Please edit your question to show the result of the terminal command: sudo modprobe wl Did you read and follow this part of the link you gave? "In some computers, before performing the commands, you will need to deactivate the Secure Boot Options in your BIOS."
    – chili555
    Oct 24, 2020 at 20:05
  • Edited. I'm about to try disabling Secure Boot.
    – raphael
    Oct 24, 2020 at 20:16
  • I believe you need: sudo apt install --reinstall bcmwl-kernel-source
    – chili555
    Oct 24, 2020 at 20:26
  • That got rid of the other message, but no Wi-Fi. Finally got into the BIOS only to discover that Secure Boot was disabled all along.
    – raphael
    Oct 25, 2020 at 1:08
  • 1
    I suggest that you add to the bug report here: bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1879547 I can, so far, find no solution.
    – chili555
    Oct 28, 2020 at 13:12

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