[Bug 1742933] Re: Regression in 2018-01-08 updates

[Thomas]

The microcode file found in 3.20180108.0+really20170707ubuntu16.04.1 for
my Haswell CPU still causes problem that I haven't had before.

When booting the kernel, it cannot find any partitions. Funiliy, the
initrd file contains nothing but the microcode file. Reverting manually
to a known-good initrd file (also containing nothing but the microcode
file) fixes it.

Here the relevant sha1sums:

Good:
d41b5f3302bdccec086c78f88d6eae923b64086a  kernel/x86/microcode/GenuineIntel.bin
Bad (found in 3.20180108.0+really20170707ubuntu16.04.1):
d63a2a7ecf16463c196f83b8f260d0e8a7ad4e27  kernel-1/x86/microcode/GenuineIntel.bin

(GenuineIntel.bin is sourced from 
/lib/firmware/intel-ucode/0/06-3c-03.initramfs on my Haswell CPU)

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https://bugs.launchpad.net/bugs/1742933

Title:
  Regression in 2018-01-08 updates

Status in intel-microcode package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Trusty:
  Fix Released
Status in intel-microcode source package in Xenial:
  Fix Released
Status in intel-microcode source package in Zesty:
  Won't Fix
Status in intel-microcode source package in Artful:
  Fix Released
Status in intel-microcode source package in Bionic:
  Confirmed
Status in intel-microcode package in Debian:
  Fix Released

Bug description:
  There is a regression in the Intel 20180108 microcode updates that is
  causing issues for some devices:

  https://newsroom.intel.com/news/intel-security-issue-update-
  addressing-reboot-issues/

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