The possible downsides to bundling the microcode with the kernel are:
- For users, inability to downgrade microcode without also downgrading the 
kernel.
- For Ubuntu Security Team, inability to release microcode updates outside the 
kernel release cycle. This had been curtailed by the AMD SHA-checking patch, 
but some flexibility still remains. Microcode updates are released well in 
advance of any communication of what they fix, so their SHAs could be included 
in kernel releases, without the corresponding microcode updates.
- Creating an inconsistency with the intel-microcode package, which does not 
have these limitations.

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

Title:
  hashed microcode updates

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