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[Launchpad Bug Tracker <1882890@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package intel-microcode -
3.20200609.0ubuntu0.16.04.1

---------------
intel-microcode (3.20200609.0ubuntu0.16.04.1) xenial-security; urgency=medium

  * REGRESSION UPDATE: some CPUs in the Skylake family sig=0x406e3
    fail to boot (LP: #1882890).
    - revert 06-4e-03/0x000406e3 microcode from 0x00dc to 0x00d6
      sig 0x000406e3, pf_mask 0xc0, 2019-10-03, rev 0x00d6, size 101376

 -- Steve Beattie <sbeattie@xxxxxxxxxx>  Wed, 10 Jun 2020 08:50:22 -0700

** Changed in: intel-microcode (Ubuntu Xenial)
       Status: Confirmed => Fix Released

** Changed in: intel-microcode (Ubuntu Eoan)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1882890

Title:
  intel-ucode/06-4e-03 from release 20200609 hangs system in early boot

Status in intel-microcode package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Xenial:
  Fix Released
Status in intel-microcode source package in Bionic:
  Fix Released
Status in intel-microcode source package in Eoan:
  Fix Released
Status in intel-microcode source package in Focal:
  Fix Released

Bug description:
  Hi,

  This morning I applied the latest updates on my Ubuntu 16.04 (kernel
  4.15.0-106-generic + intel-microcode 3.20200609.0ubuntu0.16.04.0) and
  rebooted as usual to boot on the new kernel but the system won't boot:
  black screen.

  I tried booting the previous kernel 4.15.0-101 and it seems to be the
  same : in grub I select the 4.15.0-101 kernel, press enter, a message
  "Loading initrd..." is printed but nothing else happens.

  Tried even older kenrel 4.4.0-184-generic : same problem, "Loading
  initrd...", and nothing happens.

  I managed to boot a 4.4.0-142-generic, but bluetooth and wifi are non-
  functionnal.

  I mounted the /boot partition from a USB rescue drive, and it seems that all the initrd images that got updated this morning are not bootable anymore :
  - initrd.img-4.15.0-106-generic
  - initrd.img-4.15.0.101-generic
  - initrd.img-4.4.0-184-generic

  I tried regenerating the images with update-initramfs but it's the
  same : "Loading initrd" message but nothing happens.

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