[Bug 1882943] Re: Boot freezes silently after 'intel-microcode' upgrade

[Mirek Ingr]

Correct, Ubuntu 20.04 LTS/focal.

Results of upgrading intel-microcode package to 3.20200609.0ubuntu0.20.04.2:
1) First reboot was successful (without dis_ucode_ldr flag)
2) Second and following reboots froze again, the behaviour is now the same as stated in #1883002.
3) Workaround: Grub's dis_ucode_ldr flag fixes the problem, at least on a temporary basis.

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https://bugs.launchpad.net/bugs/1882943

Title:
  Boot freezes silently after 'intel-microcode' upgrade

Status in intel-microcode package in Ubuntu:
  New

Bug description:
  1) # apt dist-upgrade froze suddenly,
  2) and Ubuntu's boot sequence had frozen completely, silently (no warnings nor errors even in debug mode!!) and permanently,
  3) after many trials  to recover the system,
  4) I added 'dis_ucode_ldr' boot option to Grub2/Ubuntu configuration,
  5) and hurray, the system booted finally :)

  There must be something wrong with:
  a) CPU firmware
  b) intel-microcode package

  Dell Latitude 5591, Intel Core i7-8850H

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