GNU/Linux Mint 20 Installing Broadcom B43 Legacy Firmware
Hi! The Tutorial shows you Step-by-step How to Install Broadcom B43 Legacy Wifi/Bluetooth Driver in GNU/Linux Mint 20.x Ulyana/Ulyssa/Uma/Una LTS.
And Broadcom B43 Legacy Firmware for Linux Mint 20 is including the Proprietary Code to support some Wireless Devices.
Especially relevant: the b43 Legacy Driver supports the following devices
BCM4301
BCM4306
BCM4306/2
BCM4309
For other BCM43xx Models see instead Broadcom Wl or Broadcom B43.

1. Launching Terminal
How-to Quick-Start with Command Line on Mint GNU/Linux
First, Update the Apt Repo Sources with:
sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
Contents
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