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

[Ivan Larionov]

For the sake of testing I've updated to the latest grub from 19.10
(2.04-1ubuntu12) and I can't boot Windows anymore. My exact steps were:

0. Ubuntu 19.10 with grub from 19.04. Everything works
1. Move /etc/grub.d/07_os-prober back to /etc/grub.d/30_os-prober to rule this change out
2. sudo apt update && sudo apt dist-upgrade
3. sudo grub-install /dev/sda
4. sudo update-grub
5. Reboot
6. Can't boot Windows anymore

I've compared grub config from 2.02 to 2.04. They look almost exactly
the same. The only differences are:

-		set vt_handoff=vt.handoff=1
+		set vt_handoff=vt.handoff=7

and

+### BEGIN /etc/grub.d/10_linux_zfs ###
+### END /etc/grub.d/10_linux_zfs ###

Windows part config:

menuentry 'Windows Boot Manager (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-efi-CAC2-FF0C' {
 insmod part_gpt
 insmod fat
 set root='hd0,gpt1'
 if [ x$feature_platform_search_hint = xy ]; then
   search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  CAC2-FF0C
 else
   search --no-floppy --fs-uuid --set=root CAC2-FF0C
 fi
 chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

I've recorded video of boot process with "set debug=all" grub config.
Send me a message through https://launchpad.net/~xeron-
oskom/+contactuser if you want to see it.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
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:
  Confirmed

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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1845289/+subscriptions