This bug is *not* a duplicate of 1839317; since we're not looking at
ARM-based systems here.
Could you please update your grub-efi-amd64 and grub-efi-amd64-signed
packages (well, make sure your system is fully up to date), then run:
sudo grub-install -v
And include the output here.
Not all the failures here are for the same causes:
Joseph Maillardet (jokx), it looks like the packages are not all
installed correctly, though I am not sure why (grub-install will tell);
so you are booting GRUB directly, not through shim, so Secure Boot is
being skipped in fun ways. This means chainloading Windows from GRUB is
unlikely to work.
Ivan, it sounds like your Windows no longer has a bootloader --
otherwise you should still see "Windows Boot Manager" work to boot
Windows. If you see GRUB again, then it means something went missing on
disk, in which case, per my comment #6, we would need to see what is on
disk under /boot/efi.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1845289
Title:
Grub EFI amd64 no longer start EFI/Microsoft/Boot/bootmgfw.efi
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