From the article (and I did this myself, although my connection was fine):
An Ethernet connection should be functional at this time, but users are urged to download the latest Incompatible Kernel Extension Configuration Data version 3.28.2 software by opening Terminal and entering in sudo softwareupdate —background. Quit Terminal and restart once more to finalize the install procedure.If that doesn't apply to you, read
this Apple support document, linked from the original article that I posted. Otherwise, if you have a bootable clone, boot from it and see if the internet connection works. If so, update any relevant files manually (if you can) and clone back. That worked for me on Saturday. BTW, System Information reports, for me, that the fix was installed yesterday at 12:17 PM.
