The issue appears to be that update-initramfs creates uncompressed
images.

I have the same error but have been dealing with a different issue of it
failing to boot with a custom kernel by UUID which is why I haven't
posted a bug report. However, since this issue appears to be related,
upon further inspection I find that none of the initramfs images being
created are actually compressed at all.

file /boot/initrd.img*
/boot/initrd.img:                  symbolic link to initrd.img-5.4.0-40-generic
/boot/initrd.img-5.4.0-33-generic: ASCII cpio archive (SVR4 with no CRC)
/boot/initrd.img-5.4.0-37-generic: ASCII cpio archive (SVR4 with no CRC)
/boot/initrd.img-5.4.0-39-generic: ASCII cpio archive (SVR4 with no CRC)
/boot/initrd.img-5.4.0-40-generic: ASCII cpio archive (SVR4 with no CRC)

These should all be lz4 images. I tried changing the initramfs config to
gzip but it still did not show a compressed file.

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https://bugs.launchpad.net/bugs/1835660

Title:
  initramfs unpacking failed

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