No WiFi networks listed; Ubuntu 20.04; Broadcom BCM4360

I'm not able to view any wifi networks using my BCM4360 network card in my laptop using 20.04. Could anyone help me out here? Thanks.

Please let me know if any other information is required to help debug this problem

Edit: Interestingly, ubuntu is able to list nearby bluetooth devices.

lspci -vvnn | grep -A 9 Network
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03) Subsystem: Apple Inc. BCM4360 802.11ac Wireless Network Adapter [106b:0112] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+ Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 17 Region 0: Memory at f1200000 (64-bit, non-prefetchable) [size=32K] Region 2: Memory at f1000000 (64-bit, non-prefetchable) [size=2M] Capabilities: <access denied> Kernel driver in use: wl Kernel modules: bcma, wl

dmesg | grep wl
[ 4.145754] wl: loading out-of-tree module taints kernel.
[ 4.145759] wl: module license 'MIXED/Proprietary' taints kernel.
[ 4.152672] wl: module verification failed: signature and/or required key missing - tainting kernel
[ 4.246755] wlan0: Broadcom BCM43a0 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)
[ 4.592163] wl 0000:03:00.0 wlp3s0: renamed from wlan0

rfkill list all
0: tpacpi_bluetooth_sw: Bluetooth Soft blocked: no Hard blocked: no
1: hci0: Bluetooth Soft blocked: no Hard blocked: no
2: phy0: Wireless LAN Soft blocked: no Hard blocked: no
3: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: no

2

3 Answers

In Jan 2021 my network stopped on a MacBook Air 2015 after an Ubuntu 20.04 update.

This a summary of how I got it working again:

Enable the use of proprietary drivers. For example in 'Software & Updates / Ubuntu Software'
sudo apt update
sudo apt remove --purge bcmwl-kernel-source
sudo apt install --reinstall broadcom-sta-dkms
Reboot you computer

during August 2021 kernel 5.11.0-25-generic update , the broadcom wifi stopped working

The purge and reinstall got it working again.

BR

Use this driver:

/etc/modprobe.d/blacklist.conf
# wireless drivers (conflict with Broadcom hybrid wireless driver 'wl')
blacklist ssb
blacklist bcma
blacklist b43
blacklist brcmsmac

Build and install for the running kernel:

$ make
$ make install
$ depmod -A
$ modprobe wl

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