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.
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.