I get the "module verification failed" messages for libahci.ko. If the
module is signed, running:

  hexdump -C /path/to/module | tail -n 5

should show the string "~Module signature appended~" at the end. I see
that with i915.ko for example, but with video.ko and libahci.ko I do
not. After a little poking around I'm fairly well convinced that the
ones lacking signatures are all in the generic inclusion list. These
modules must be getting stripped in such a way that the signatures are
getting removed, or something like that.

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https://bugs.launchpad.net/bugs/1253155

Title:
  Failure to validate module signature at boot time

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