You’ll need to download the following packages:
Copy these packages onto a USB drive and manually install them. I downloaded these using my mobile and connected it via MTP, I then copied the packages to my
$HOME/Desktop and manually installed them.
Launch the terminal (
Ctrl + Alt + T) and enter the following commands to manually install:
$ sudo dpkg -i libfakeroot*.deb
$ sudo dpkg -i fakeroot*.deb
$ sudo dpkg -i dkms*.deb
$ sudo dpkg -i bcmwl-kernel-source*.deb
Upon completion, you shall be able to connect to Wi-Fi.