I don't see any evidence that this is an issue with udev itself. Rather,
udev upgrades cause update-initramfs to run, which triggers flash-kernel
to generate u-boot-bootable files (uImage, uInitrd), which will also
create a backup of the existing boot files (uImage->uImage.bak and
uInitrd->uInitrd.bak) for recovery purposes. I'm guessing you have
enough kernels installed that there just isn't room for these .bak files
in /boot.

Some suggestions:
  1) Assuming you don't require a fallback kernel, remove /boot/uImage.bak and 
/boot/uInitrd.bak before installing new kernels. This will give flash-kernel 
more space to work with.
  2) If you have more than 2 kernels installed (current + next), try removing 
older kernels before installing new ones.
  3) Create a larger /boot partition.

** Changed in: linux-signed-hwe-5.8 (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1926440

Title:
  udev in proposed does not work with 5.8.0-51.57~20.04.1 on Moonshot
  ARM64 (/boot filled up)

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