Wifi Problem on Ubuntu 20.04 –

I have installed the Ubuntu 20.04 to my old laptop Lenovo G580.

Since then I could connect internet via ethernet but there is no sign or driver for Wifi. So, I tried a couple of solution, installing kernel etc. But there is still the problem.

The driver is Broadcom BCM43142 802.11b/g/n (rev 01)

Appreciate any help, I try every solution find in websites….

>Solution :

Open a shell terminal window (you may press Ctrl Alt T or right-click a free area of your Desktop and then select Open Terminal, among other ways to do it) and then run the commands below.

1. Install the Linux firmware support package and also the Broadcom support packages for your device (the two broadcom-* packages below add support for BCM43142):

   sudo apt install linux-firmware broadcom-sta-common broadcom-sta-dkms -y --reinstall
   

2. Unload conflicting Broadcom modules (i.e. kernel device drivers for other/conflicting Broadcom devices):

   modprobe -r b44 b43 b43legacy ssb brcmsmac
   

3. Load the wifi module for your Broadcom device:

   sudo modprobe wl
   

4. Reboot:

   reboot
   

PS: if step #2 fails, try running step #3 before step #2 (i.e. first load the wl module and only then attempt to unload the conflicting modules). If step #3 fails aswell or for any reason your wifi still doesn’t work, disable Secure Boot and then try the above steps again.