> What is the range of possible values for this -D option, and why would
you ever want to specify it in the netplan yaml instead of inferring it?

It would be best if wpa_supplicant selected the correct driver, but it
seems it doesn't do a good job with this. It does support fallbacks,
though, which seems like a reasonable default behavior for
wpa_supplicant ("-Dnl80211,wext"), but sometimes different drivers have
different behaviors/abilities, so explicitly choosing one is useful.

I see two issues:
- wpa_supplicant makes no attempt to automatically pick a working driver
- netplan doesn't have a way to choose a driver if wpa_supplicant's default 
(nl80211) doesn't work

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https://bugs.launchpad.net/bugs/1814012

Title:
  netplan type wifis needs a device option

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