[Bug 1882890] Re: intel-ucode/06-4e-03 from release 20200609 hangs system in early boot

[Henrique de Moraes Holschuh]

According to Intel, this bug has been fixed in the microcode updates
released in the 20210608 package.

HOWEVER one must go from BIOS to the newest microcode update directly,
using kernel early updates.  This is how it is supposed to happen by
default in Debian (and, AFAIK, Ubuntu nowadays) so it should just work.

https://github.com/intel/Intel-Linux-Processor-Microcode-Data-
Files/issues/31#issuecomment-876558374

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

Status in intel-microcode package in Ubuntu:
  Fix Released
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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