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I have an ancient 2008 MacBook Air laptop. I installed Elementary OS on it. Everything works fine, except Wi-Fi. It doesn't work out of the box. I attempted the advice here, namely:

sudo apt remove broadcom-sta-dkms bcmwl-kernel-source
sudo apt install firmware-b43-installer

but that didn't work.

The default bcmwl-kernel-source driver also doesn't function.

Virtually every other distro worked for me by trying either of the two aforementioned solutions. I'm currently connecting with a Wi-Fi USB card.

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Try adding pio=1 qos=0 on modprobe file by

 sudo touch /etc/modprobe.d/b43.conf
 echo "options b43 pio=1 qos=0" | sudo tee -a /etc/modprobe.d/b43.conf

reboot or reload b43 driver

  • Works like a lucky charm! Thank you! What I did was enter the first two lines of code in my question, then completed by entering your answer, and voilà! – user24423 Nov 18 '20 at 22:58

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