Thank you so much for this -- just wanted to say that this advice worked for me, too, with slightly different specs:
MacBook Pro Late 2012
Ubuntu 18.04 with Linux kernel 4.15.0-29-generic
sudo lshw -C network says my Broadcom is BCM4331
I had already tried a bunch of things, including reinstalling bcmwl-kernel-source, but what got it to work was following the first part of wildmanne39's advice and rebooting. I didn't have to follow the second part with purging broadcom-sta-dkms. When I rebooted my wifi options were showing!! Thank you!!
TYVM! I did the wireless script in your signature then the codes as you said... works perfectly!
Running Ubuntu 19.04 on a Macbook Pro mid 2010
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