I just did a fresh install of Ubuntu 20.04
on an old computer and after 1-2H of usage the WiFi drops and there is no way to connect it back since the prefs show an error message: No wifi adaptor found. (Works again after a reboot).
FYI: The wifi card is an Atheros AR9485
(internal) and is running using ath9k
& everything is up-to-date
Go to Source
Author: Skïp