Worked on late-2008 Macbook Pro and Ubuntu:
- Use Ethernet cable
- Confirm hardware: lspci -vvnn | grep -A 9 Network -> Broadcom 4322 chipset
- Install proprietary driver instead of b43
For some reason, Ubuntu’s “Additional Driver” showed 0 option to update from that menu. Thus, I followed the manual update steps described in the documentation, more precisely these commands:
sudo apt-get update
sudo apt-get --reinstall install bcmwl-kernel-source
sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma
sudo modprobe wl
References:
https://askubuntu.com/questions/1076964/macbook-can-t-find-wifi-for-ubuntu-18-043
https://help.ubuntu.com/community/MacBookPro_Penryn