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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.8/+bug/1926440/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs