[Bug 1839317] Re: Grub fails to chainload the Windows Boot Manager on aarch64 laptops

[Daniel Ferradal]

I can confirm it happens to me to in amd64 PC.

Here is the info of the package installed right now:

Package: grub2
Version: 2.04-1ubuntu12
Priority: extra
Section: universe/admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Original-Maintainer: GRUB Maintainers <pkg-grub-devel at alioth-lists.debian.net>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 16,4 kB
Depends: grub-pc (= 2.04-1ubuntu12), grub-common (= 2.04-1ubuntu12)
Homepage: https://www.gnu.org/software/grub/
Download-Size: 2.576 B
APT-Sources: http://es.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
Description: GRand Unified Bootloader, version 2 (dummy package)
 This is a dummy transitional package to handle GRUB 2 upgrades.  It can be
 safely removed

Package: grub2-common
Version: 2.04-1ubuntu12
Priority: optional
Section: admin
Source: grub2
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Original-Maintainer: GRUB Maintainers <pkg-grub-devel at alioth-lists.debian.net>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 1.338 kB
Depends: grub-common (= 2.04-1ubuntu12), dpkg (>= 1.15.4) | install-info, libc6 (>= 2.28), libdevmapper1.02.1 (>= 2:1.02.36), libefiboot1 (>= 37), libefivar1 (>= 37), liblzma5 (>= 5.1.1alpha+20120614)
Conflicts: grub-legacy
Breaks: grub (<< 0.97-54), grub-cloud-amd64 (<< 0.0.4), grub-coreboot (<< 2.02+dfsg1-7), grub-doc (<< 0.97-29ubuntu60), grub-efi-amd64 (<< 2.02+dfsg1-7), grub-efi-arm (<< 2.02+dfsg1-7), grub-efi-arm64 (<< 2.02+dfsg1-7), grub-efi-ia32 (<< 2.02+dfsg1-7), grub-efi-ia64 (<< 2.02+dfsg1-7), grub-ieee1275 (<< 2.02+dfsg1-7), grub-legacy-doc (<< 0.97-29ubuntu60), grub-pc (<< 2.02+dfsg1-7), grub-uboot (<< 2.02+dfsg1-7), grub-xen (<< 2.02+dfsg1-7), grub-yeeloong (<< 2.02+dfsg1-7), shim (<< 13)
Replaces: grub, grub-cloud-amd64 (<< 0.0.4), grub-common (<< 1.99-1), grub-coreboot (<< 2.02+dfsg1-7), grub-doc (<< 0.97-29ubuntu60), grub-efi-amd64 (<< 2.02+dfsg1-7), grub-efi-arm (<< 2.02+dfsg1-7), grub-efi-arm64 (<< 2.02+dfsg1-7), grub-efi-ia32 (<< 2.02+dfsg1-7), grub-efi-ia64 (<< 2.02+dfsg1-7), grub-ieee1275 (<< 2.02+dfsg1-7), grub-legacy, grub-legacy-doc (<< 0.97-29ubuntu60), grub-pc (<< 2.02+dfsg1-7), grub-uboot (<< 2.02+dfsg1-7), grub-xen (<< 2.02+dfsg1-7), grub-yeeloong (<< 2.02+dfsg1-7)
Homepage: https://www.gnu.org/software/grub/
Task: ubuntu-live, kubuntu-live, xubuntu-live, lubuntu-live, ubuntustudio-desktop-core, ubuntustudio-desktop, ubuntukylin-live, ubuntu-mate-live, ubuntu-budgie-live
Supported: 9m
Download-Size: 589 kB
APT-Manual-Installed: yes
APT-Sources: http://es.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
Description: GRand Unified Bootloader (common files for version 2)
 This package contains common files shared by the distinct flavours of GRUB.
 The files in this package are specific to GRUB 2, and would break GRUB
 Legacy if installed on the same system

I can "fix it" temporarily doing grub-install /dev/sda but next windows
reboot it fails again.

I have forced windows to use "\EFI\ubuntu\grubx64.efi" so I am not sure
if grub2 is to blame, but on ubuntu 19.04 this seemed to work correctly.

-- 
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/1839317

Title:
  Grub fails to chainload the Windows Boot Manager on aarch64 laptops

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  After an update to 2.04 Grub fails to chainload into Windows.

  When selecting the menu item to boot into the Windows Boot Manager,
  the menu flashes and returns.

  When trying to chainload/boot via the Grub command line, nothing
  happens and the prompt reappears.

  When using the same commands in an earlier version (on a bootable USB
  stick) Windows sparks into life.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1839317/+subscriptions