I upgraded ubuntu recently and my wifi stopped showing on the settings file and navigation part. Upon searching it, it shows "No wifi adapter found". Turns out even though I am able to see bluetooth sign on navigation panel I am not able to switch it on. I upgraded using
sudo do-release-upgrade
If I do
sudo lshw -C network
It shows network Unclaimed, product: Wi-fi 6 AX201 and other product details. Hopefully this information will be helpful.