How was this system installed? Was it installed in BIOS mode and then
changed to UEFI?
Is shim-signed correctly installed on the system? Without shim-signed
installed and present on the ESP partition
(/boot/efi/EFI/ubuntu/bootx64.efi); as well as listed as the BootEntry
to load (sudo efibootmgr -v will tell), the system will not be able to
boot an image recognized as valid by the Microsoft keys that are usually
on these systems.
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1745740
Title:
[Xenial] Update to kernel 4.4.0-112-generic make the system failed to
boot with enabled BIOS SecureBoot mode
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