Public bug reported:
Installed Ubuntu 20.04 from USB disk using the first Ubuntu 20.04
installation image released end of April. The system installs and boots
fine. Then, I run a system update via `apt update && apt upgrade` with
updates to Ubuntu 20.04.1. intel-microcode is updated on this occasion
to version 3.20201110.0ubuntu0.20.04.2. Update installation succeeds but
subsequent reboots most of the time fail. I can access GRUB but a normal
boot of any of the installed kernels results in either a black screen or
a screen with a cursor blinking ad infinitum. Booting in recovery mode
via GRUB and then "resume" works, but external display is not detected
in this case. Sometimes however (maybe 1/5 of the time), making a reboot
from this state works.
When I uninstall intel-microcode via `apt purge intel-microcode` the
problems disappear. I can boot the system without any problem.
I had occasional boot problems already since several months, but they
could be resolved by just rebooting (pressing the power key for a long
time). After the latest update, this wouldn't work anymore, so in the
end I tried out re-installing Ubuntu which resulted in the problems
described above.
I'm using a Lenovo ThinkPad T460s with system firmware version N1CET37W
(1.05) which is quite old.
** Affects: intel-microcode (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1911959
Title:
Fresh Ubuntu 20.04 won't boot after intel-microcode update on ThinkPad
T460s
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