I suspect Windows fails to boot because the NX compatibility check, and Ubuntu only fails to boot when you've once unsuccessfully tried booting Windows without restarting GRUB.
Please get the set debug=peimage output from GRUB as explained above. And also can you get the output of efibootmgr -v from under Linux. I suspect what's going on here is an ASUS firmware bug that I have encountered before where the firmware is creating boot entries pointing to GRUB, bypassing shim which in turns stops shim from disabling the NX enforcement check. If in efibootmgr there is a higher priority boot entry pointing to grubx64.efi then shimx64.efi, then make sure to swap it around to have shimx64.efi first and it should magically work. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2078307 Title: Grub 2.12 in Oracular is unable to boot Windows using chainloader To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cd-boot-images-amd64/+bug/2078307/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
