grub-install -v --target=x86_64-efi --recheck /dev/sda
if not try
#mount -o remount,rw /dev/sda1 /mnt/boot/efi
#mount -t efivarfs efivarfs /sys/firmware/efi/efivars
# rm /sys/firmware/efi/efivars/dump-*
blog about linux tricks
grub-install -v --target=x86_64-efi --recheck /dev/sda
if not try
#mount -o remount,rw /dev/sda1 /mnt/boot/efi
#mount -t efivarfs efivarfs /sys/firmware/efi/efivars
# rm /sys/firmware/efi/efivars/dump-*
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