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
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Author: Skïp