If you have a Lenovo Yoga or similar model or even a laptop that Ubuntu just cannot seem to find the wireless card, follow these instructions:

https://askubuntu.com/questions/1180765/intel-wifi-card-not-working-on-ubuntu

You have to make sure you follow the edit of the answer which is to do the update and install linux-oem-osp1. If you don’t do this, it will not work. Also, reboot. You should see the wireless device show up upon checking it via settings.