** Description changed:
+ [Impact]
+ Dual-boot users who have somehow had shim uninstalled from their system /
Secure Boot disabled.
+
+ [Test case]
+ (system with dual-boot setup for Ubuntu and Windows)
+ 1) uninstall shim/shim-signed from the system
+ 2) Run 'sudo grub-install -v'; ensure grubx64.efi is installed as the ubuntu
bootentry (check 'sudo efibootmgr -v')
+ 3) Reboot.
+ 4) In system firmware, ensure Secure Boot is disabled.
+ 5) Attempt to start Windows from the Grub menu.
+
+ Verify that Windows is chainloaded from Grub successfully; without
+ returning to the GRUB menu or restarting the whole system.
+
+ [Regression potential]
+ Minimal; this is returning the state of the code paths for linuxefi
validation back to how they were in GRUB 2.02; the extra check for the Secure
Boot state is unnecessary at that point since it will be run again later when
validating the images. This affects all validation code paths on UEFI but the
net effect of reverting that change should be nil due to the duplication of
code that already exists.
+
+ ---
+
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
+ 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)
** Changed in: grub2 (Ubuntu)
Status: Incomplete => In Progress
** Changed in: grub2 (Ubuntu Eoan)
Status: Confirmed => Triaged
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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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