In case your WiFi is not working on Ubuntu Server 20.04 (this happened to me), this shows you the steps I took to get it up and running. You might not require all of the steps. I recommend just trying the first step which involves editing the yaml file located in /etc/netplan. If that doesn't work then try the next step which involves wpasupplicant.
Note: If you can just use ethernet do that instead :)
Links:
Netplan Examples: netplan.io/exa...
Ubuntu Packages list: packages.ubunt...
wpasupplicant package: packages.ubunt...
Негізгі бет How to get WiFi working on Ubuntu Server 20.04
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