Fix Ubuntu 17.10 No Wi-Fi Adapter Found on DELL XPS 13

Never take your wifi for granted with Linux ! After updating to Ubuntu 17.10 on your dell XPS 13, did you find yourself devoid of wifi ?

Fortunately the solution is simple, just run this command :

sudo apt install --reinstall bcmwl-kernel-source

It will reinstall the driver for the Broadcom Wireless Card of your laptop.

You might need to sudo reboot after, but I didn't.

More detailed instructions can be found here : https://askubuntu.com/a/60395/649516

Good luck sir !