Public bug reported:
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
** Affects: intel-microcode (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1882943
Title:
Boot freezes silently after 'intel-microcode' upgrade
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