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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839317 Title: Grub fails to chainload the Windows Boot Manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1839317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
