On the kernel code supporting multiple microcodes, since we're
generating an initrd per kernel image, wouldn't it suffice to ensure
that the microcode attached to the initrd is supported by the associated
kernel image?

Regarding the package relationships, I agree that it'd be ideal if we
could avoid changing them. A benefit I can see, however, is that
installing an updated amd64-microcode package could lead to a false
sense of security, because it's useless without a kernel image that has
its hash. On the other hand, it's also useless unless that kernel is
booted with its associated initrd.

Random thought: what about UKIs?

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https://bugs.launchpad.net/bugs/2130658

Title:
  hashed microcode updates

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