Please hook up the ethernet temporarily and do:
sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install linux-firmware-nonfree
sudo modprobe b43
Is it working now?
BCM4311 Wireless Not Working with Drivers Installed [duplicate]
Please hook up the ethernet temporarily and do:
sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install linux-firmware-nonfree
sudo modprobe b43
Is it working now?