Public bug reported:

On a dual boot computer with Windows 10 Pro and Ubuntu 19.10, since a
month, Grub was unable to boot Windows 10. Hitting the Windows entry
line give me a 0.1s black screen and get me back to Grub Menu.

sudo update-grub give me :

Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.3.0-10-generic
Found initrd image: /boot/initrd.img-5.3.0-10-generic
Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: grub-efi-amd64 2.04-1ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-10.11-generic 5.3.0-rc8
Uname: Linux 5.3.0-10-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 25 08:01:05 2019
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to eoan on 2018-11-14 (314 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

** Attachment added: "/boot/grub/grub.cfg"
   https://bugs.launchpad.net/bugs/1845289/+attachment/5291052/+files/grub.cfg

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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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