Public bug reported:
Almost identical to bug #1925010, but the T420 is an UEFI v2.00 machine,
so I'm filing this separate bug.
This is a T420 in uefi mode, but not secure boot. I was running groovy,
and just upgraded to hirsute with do-release-upgrade -d. It just
wouldn't boot from the disk anymore after that. Black screen, no disk
activity, no ctrl-alt-del response. I always had to power cycle it.
I then performed the steps from comment 2 of that bug, and the machine booted
normally after that:
"""
Can you please check that the machine boots with just grub without shim.
Aka, replace /EFI/Boot/BOOTX64.efi & /ef/ubuntu/shimx64.efi files wtih
/efi/ubuntu/grubx64.efi => this could possibly be a workaround, given that
secureboot is not possible on Mac platforms.
"""
My BIOS version is 1.49 (83ET79WW), model is 4177CTO. I can attach more info if
needed, and it's also simple to restore the buggy behavior.
dmesg says "efi: EFI v2.00 by Lenovo"
** Affects: shim (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1925064
Title:
shim(-signed)? does not boot on T420
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