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

[Rene Meier]

I'm also facing the same problem and I found a solution which worked for
me on amd64. My system is using UEFI without secure boot from a gpt
partitioned drive.

Please try to install the package shim-signed.

This fixed the problem for me. Chainloading Windows even works after
uninstalling the package again. So I expect it is something related to
the installation process of the package. Maybe it leaves some important
files in /boot after uninstalling.

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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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