Offline install fails because apt cache knows about grub-efi-amd64-signed from xenial-updates which is newer than the version in the ISOs' pool/ directory. Either the newest signed deb should be packed on the ISO (preferred) or it should be made sure that the apt cache only contains xenial stock without updates.
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seems it also affects ubuntu
http://askubuntu.com/questions/789998/16-04-new-installation-gives-grub-efi-amd64-signed-failed-installation-target
it's in ship-live which is the repo on the ISO itself but there's a newer version in xenial-updates so it won't install.
Needs working out why ship-live isn't picking up xenial-updates