One of the installs on the same machine is Arch. Executing update-grub runs the os-prober script (which searches for other operating systems), and it correctly finds the Arch installation, then adds it to the grub menu. But, because Arch requires an intel-ucode.img file to be loaded in addition to the initramfs-linux.img file, update-grub does not add the intel-ucode.img to the initrd line of grub.cfg.
Instead the initrd line looks like this:
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initrd /initramfs-linux.img
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initrd /intel-ucode.img /initramfs-linux.img
grub configuration be changed so that update-grub will add the intel-ucode.img file to the initrd line?