Intel AX200 Wifi card abruptly stopped working on Dual Boot system with Ubuntu 20.04 and Windows 10
Solution 1:
As suggested appropriately by users @Nmath and @chilli555, I had a hardware failure in my system which led to this state. For anyone interested, never blow pressurized air from a blower to clean dust from electronic components for long : if the air gets warm (thanks to the motor), it can condense on the electronics and failures can arise from short circuiting.