Can unfortunately not confirm any functionality, but I had Ubuntu touch installed before, it is still running android underneath and even though it was working okayish, I still went back to LineageOS at the time and GrapheneOS now. Ubuntu touch is not a "true/full" Linux OS like the PinePhone OSs.
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The devices overview doesn't go into so much detail: https://devices.ubuntu-touch.io/device/fp4/
Probably best to ask on the UT forums directly.
Very late reply but I've been running UBPorts on a Fairphone 4 for a couple of years and the camera works fine (besides very oversaturated colours in photos, but I'm not sure if that's a software issue or the phone itself)
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