Install firmware-b43-installer by entering the following commands in the terminal:
sudo apt update sudo apt install firmware-b43-installer
Description:
firmware installer for the b43 driver
This package downloads and installs the firmware needed by the b43 kernel driver for some Broadcom 43xx wireless network cards. . Supported chipsets: * BCM4306/3; * BCM4311; * BCM4318; * BCM4321; * BCM4322 (only 14e4:432b); * BCM4312 (with Low-Power a.k.a. LP-PHY).
Homepage: http://wireless.kernel.org/en/users/Drivers/b43
Version: 1:019-3
Section: multiverse/kernel