Great question — answering as the UphillTech team:
You can try opening "Software Sources", or "Software and Updates" from the dash. Then, go to the "Additional Drivers" or "Proprietary Drivers" tab, and see if you can enable the driver your wireless card there. If that doesn't work, try installing the appropriate driver for your computer's wireless card from the list here http://wireless.kernel.org/en/users/Drivers .
Full answer by 1lann: https://askubuntu.stackexchange.com/a/369923 (CC BY-SA 3.0).
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