networking – No USB wifi adapters (3) will show in iwconfig after plugging them in

Ubuntu 20

Starting with this answer I’m trying to use a USB wifi adapter because I can’t get the onboard wifi to detect my (known good working) wifi. Isolating variables, maybe the onboard wifi doesn’t work. This device is way past its warranty. I’ve always used wired connections with it.

EW-7822UAC: iwconfig shows only wlp3s0 before plugging in. Plugged in device. iwconfig shows only wlp3s0 after plugging in. This one was suggested by someone as a known good working device for Ubuntu 20.

Cudy WU1300S: iwconfig shows only wlp3s0 before plugging in. Plugged in device. No response from iwconfig. Waited several minutes. Powered computer down and rebooted.

Eduplove (no model, says it’s compatible with linux): same result as the Cudy WU1300S

Is there some issue with Ubuntu 20 and USB wifi adapters? How do I find it and fix it?

Use USB wifi instead of internal – manage : answer uses deprecated solution

Unable to see USB wifi : tried it, instructions are slightly wrong (the script is install.sh) but there was no change