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0e1f616
(Get the code!)
We were not able to completely pin-point the issue yet, so this is more of a blanket bug for the current issues we are seeing. We don't know where exactly the issue can be located.
While preparing and testing 18.04.4, certification reported issues with our uc18 images on the pi4 with wifi ac tests. One of our engineers (Brian) confirmed it locally with a wifi access point restricted only to 802.11ac. After some additional testing, he noticed that he had the same unreliable symptoms for both the classic and core images, as well as the 19.10.1 classic images. The symptoms seem to vary, from inability to detect 802.11ac APs, unability to connect and/or receive an IP address and no traffic getting through.
We will provide all the information that we have. Raspbian, after some initial testing, seems to work better in this regard (though we saw various reports of it still being a bit flaky). We have tried pulling in the wifi firmware bits from Raspbian and using those, but the issues were still the same.