Search:

nano /etc/apt/sources.list

Clear all and paste :


deb http://http.kali.org/kali kali-rolling main contrib non-free
# For source package access, uncomment the following line
deb-src...

Hi :)

@dmrx You must have non-free repositories in your sources.list.

Then :


apt-get update && apt-get install broadcom-sta-dkms