This command:
# pacman -S grub-efi-x86_64
fails with the following error:
warning: cannot resolve "grub-common=2.00", a dependency of "grub-efi-x86_64"
:: The following package cannot be upgraded due to unresolvable dependencies:
grub-efi-x86_64
Do you want to skip the above package for this upgrade? [y/N]
error: failed to prepare transaction (unexpected error)