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. -- 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
