That means that any AMD64 computer with windows 8 or later preinstalled, has to be capable of disabling secure boot, and mange the secure boot keys from the UEFI System settings. Microsoft dictates the requirements that any computer bearing the windows logo has to follow. Please read this to learn how to enable and disable Secure Boot for your UEFI system settings (also called BIOS) This guide assumes you have a computer with Windows 7 or later installed on a GPT-partitioned drive and booting in UEFI mode. 2 Optional: Download and install rEFInd in Windows.Or maybe I don't need efibootmgr at all, just a custom entry in /etc/grub. Maybe my Windows 8 was installed in BIOS/MBR/CSM mode, and has no EFI booting capability as I don't see a /EFI directory within it? Here are all root level directories in my Windows 8 partition: $Recycle.Bin/ ProgramData/ Again further detailed like current partition schema can be found here. I hope the fix is simply adding my Windows 8 back as an boot entry using efibootmgr, but this is where I got lost and need help. The os-prober was not able to list/find my Windows 8 either.All my Linux OS/partitions were found by update-grub, but my Windows 8 is missing from the GRUB menu.I got everything on the Linux side working afterward, but fixing Windows boot via Windows installation media failed. The detailed background is here, basically my system was initial setup in BIOS/MBR/CSM mode, Windows 10 is refusing to be installed there, so I have to converted my MBR disk to GPT. I know this is more-or-less a Windows' problem but I'm seeking a efibootmgr solution rather than a solution that uses the much more awkward Windows based bcdedit command. Basically I've lost my Windows 8 boot option and the boot repair from Windows installation media doesn't fix the problem.
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