Broadcom Wi-Fi Adapter not working on Ubuntu 20.04.2

Question

wireless-info: https://paste.ubuntu.com/p/w7nQFktm9P/

How i can get and install worked driver for this Broadcom BCM43142 adapter?

sudo modprobe wl:

modprobe: ERROR: ../libkmod/libkmod-module.c:838 kmod_module_insert_module() could not find module by name='wl'
modprobe: ERROR: could not insert 'wl': Unknown symbol in module, or unknown parameter (see dmesg)
modprobe: ERROR: ../libkmod/libkmod-module.c:990 command_do() Error running install command '/sbin/modprobe --ignore-install wl ' for module wl: retcode 1
modprobe: ERROR: could not insert 'wl': Invalid argument

mokutil --sb-state:

SecureBoot disabled

method links that i already try and get no result:

• Installing Broadcom Wireless Drivers

• https://itsfoss.com/fix-no-wireless-network-ubuntu/

• https://suryanshpradhan.wordpress.com/2020/01/17/how-to-fix-broadcom-bcm43142-wifi-not-working-on-ubuntu-18-04-3-lts/

• https://www.youtube.com/watch?v=QzYJqTLdYe0

• https://h30434.www3.hp.com/t5/Notebook-Wireless-and-Networking/Install-Braodcom-BCM43142-Driver-on-Ubuntu/td-p/6978050

• https://ibcomputing.com/install-wifi-driver-broadcom-bcm43142-linux/

Answer 1

The links you posted in your question suggest that you have tried several different packages and that, evidently, none of them are properly working. Let’s do some housekeeping and start fresh. With a temporary working internet connection by ethernet, tethering or whatever means possible, please run the terminal commands:

sudo apt purge broadcom-sta-dkms
sudo apt purge broadcom-sta-source
sudo apt purge broadcom-sta-common
sudo apt purge bcmwl-kernel-source

If some are the packages are not installed and therefore not removed, that’s fine; just proceed to the next step.

sudo apt update && sudo apt -y upgrade
sudo apt install -y bcmwl-kernel-source

Reboot.

Is there any improvement?

Edit: In our chat, we found that there were two additional wireless drivers installed. This is a possible explanation for the cfg80211 errors upon attempting to load the Broadcom driver wl.

We removed them both and rebooted. Your wireless was then working as expected.