Can't get wifi working on Aspire E15 E5-571G-35NW
If you are using Ubuntu 20.04 or newer, you’ll need to remove the bcmwl drivers and replace them with packages for Broadcom:
sudo apt purge bcmwl-kernel-source
sudo apt install broadcom-sta-source broadcom-sta-dkms broadcom-sta-common
This should do it for you.