Failed to open \EFI\Microsoft\Boot\grubx64

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https://ubuntuforums.org/showthread.php?t=2268839



sudo efibootmgr -v
ls /sys/firmware/efi/vars

sudo mount /dev/sda1 /mnt
sudo cp /mnt/EFI/ubuntu/* /mnt/EFI/Boot
sudo mv /mnt/EFI/Boot/bootx64.efi /mnt/EFI/Boot/bootx64.efi.backup

make grub be hard drive boot entry in UEFI. Then boot hard drive entry in UEFI menu.
sudo mv /mnt/EFI/Boot/grubx64.efi /mnt/EFI/Boot/bootx64.efi


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