[Bug 1882890] Re: Cannot boot initrd.img-4.15.0-106-generic on Ubuntu 16.04

[You-Sheng Yang]

@Jérôme, thank you. Could you also attach your cpu info by running
`lscpu`? That would help complete the issue description.

$ git diff --stat debian/3.20151106.1 debian/3.20200609.1 -- intel-ucode/06-4e-03
 intel-ucode/06-4e-03 | Bin 0 -> 104448 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)

Which merges Intel's new microcode release 15 hrs ago:
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-
Files/commit/021c295269a06159b8c3ebefc0fac932e69e259e

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

Title:
  Cannot boot initrd.img-4.15.0-106-generic on Ubuntu 16.04

Status in intel-microcode package in Ubuntu:
  Confirmed

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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