Wifi not connection, but showing network on Ubuntu 19

I am having the same issue, I also have a 2016 macbook pro and recently installed Ubuntu as a dual boot with MAC OS.
I tried the instructions as suggested by Cheese Sandwich, but still doesn't work.

I also tried the solution from this other post (https://ubuntuforums.org/showthread.php?t=2214110) with no luck either.

My Wifi card is Broadcom Corporation BCM4306 802.11bgn Wireless Network Adapters

Has anyone been successful at solving this issue?

Thanks