There is a similar question to my question, but the answers were more specific to that situation.
I am running Ubuntu 21.04 on a Raspberry Pi 4b. I do not see any WiFi networks in the GUI WiFi pane, even though my phone can see multiple WiFi networks and my phone is also activating a hotspot.
What is a standard way to investigate why this would be? Assuming my Pi's hardware is not broken, what factors would cause a Pi, or a computer in general, not to see any WiFi networks?