Le jeudi 22 octobre 2020 à 16:00:06 UTC+2, Albretch Mueller a écrit :
[...]
>  what should I do now?

Follow the link Dan Ritter gave to you earlier:
  http://linuxwireless.sipsolutions.net/en/users/Drivers/b43/#other_distros

it indicates to install (dpkg -i or apt install) b43-fwcutter
and then:
export FIRMWARE_INSTALL_DIR="/lib/firmware"
wget http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2
tar xjf broadcom-wl-5.100.138.tar.bz2
sudo b43-fwcutter -w "$FIRMWARE_INSTALL_DIR" 
broadcom-wl-5.100.138/linux/wl_apsta.o

You can then set up your wireless connection

Once this is done, you can install (apt install) firmware-b43-installer: this 
will prove useful (and automatic) if in the future this firmware is to be 
updated or its location changed

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