I looked into the difference between a focal classic image (with kernel
5.4.0-1008-raspi) where I can see the wlan interface and the uc20 beta
images where I cannot, and I see with the uc20 image, all of the
broadcom related kernel modules that are loaded in the focal classic
image are also loaded in the uc20 image, with a few additional ones.
Additionally, as per Dave, I checked /lib/firmware/brcm, and this
directory exists on uc20 and matches the contents of what's on classic
images.

For reference, attaching lsmod of both the focal classic image and the uc20 
image.
Focal classic lsmod: https://pastebin.ubuntu.com/p/4PxbFJRH82/ 
uc20 lsmod: https://pastebin.ubuntu.com/p/JRCVr4y76f/

So afaict this doesn't seem kernel module related, though one difference
is that we don't have the full set of kernel modules available at the
expected directory during the initramfs on uc20, while we might have
that available on the focal classic image, but I don't see why this
would affect anything.

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https://bugs.launchpad.net/bugs/1878258

Title:
  wifi missing on core20 image with rpi

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