Install Broadcom Driver iMac 2009 Ubuntu

After install of the OS no wifi driver was available
1). Under System Settings > Driver Management > Ubuntu Tab, check the box for Source Code and choose Download from Main Server

2). Install the drivers and reboot

sudo apt install firmware-b43-installer
sudo apt install linux-firmware
sudo reboot

3). Additionally helpful commands

What driver do I need

lspci -vnn | grep Network