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

[Ivan Larionov]

I have the same issue.

I can boot Windows 10 from BIOS/EFI boot menu, but can't boot it from
grub. Setting debug=chain shows that grub tries to use SecureBoot, but
it's disabled.

Wiping my grub installation, downgrading to 2.02 from disco and
reinstalling it fixed the issue.

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https://bugs.launchpad.net/bugs/1839317

Title:
  Grub fails to chainload the Windows Boot Manager

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.

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