[Bug 1845289] Re: Grub EFI amd64 no longer start EFI/Microsoft/Boot/bootmgfw.efi

[Joseph Maillardet]

Yes, by using the F12 key, I can display the EFI start menu and start
Windows with the "Windows Boot Manager" line.

This is a test machine that follows the development of "Ubuntu next".
Initially installed with Ubuntu 17.10 beta, it has followed the updates
of all Ubuntu development versions (18.04, 18.10, ...) until today. Now
in 19.10, it will soon switch to Ubuntu Focal 20.04).

The Windows part has been re-installed from scratch with an Windows 10
18.03 USB flash drive installer and regularly updated. Now running
W10-19.03.

After installing Windows, Grub was re-installed by starting the machine with Ubuntu-Live 18.04 and then entering the following commands:
$ sudo mount /dev/sda2 /mnt
$ for i in dev sys proc dev/pts; do sudo mount -o bind /$i /mnt/$i; done
$ sudo chroot /mnt
# apt purge grub-common grub-efi grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub2-common
# apt install grub-common grub-efi grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub2-common
# update-grub
(... reboot → Ubuntu ...)
$ sudo update-grub

Everything was working well until more or less half-time of 19.10
developpement.

Here my partitioning :

$ sudo parted /dev/sda print
Model: ATA M4-CT512M4SSD2 (scsi)
Disk /dev/sda: 512GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                          Flags
 1      1049kB  1075MB  1074MB  fat32        esp                           boot, esp
 2      1075MB  207GB   206GB   ext4         Ubuntu
 3      207GB   345GB   137GB   ntfs         data                          msftdata
 4      345GB   345GB   16.8MB               Microsoft reserved partition  msftres
 5      345GB   512GB   167GB   ntfs         Basic data partition          msftdata
 6      512GB   512GB   520MB   ntfs                                       hidden, diag

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https://bugs.launchpad.net/bugs/1845289

Title:
  Grub EFI amd64 no longer start EFI/Microsoft/Boot/bootmgfw.efi

Status in grub2 package in Ubuntu:
  Incomplete
Status in grub2 source package in Eoan:
  Incomplete

Bug description:
  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)

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