This bug happens also in Ubuntu 18.04. I also followed the instruction in
https://help.ubuntu.com/community/UEFI#General_principles
but it did not help.
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https://bugs.launchpad.net/bugs/1252255
Title:
The 'grub-efi-amd64-signed' package failed to install into /target/.
Without the GRUB boot loader, the installed system will not boot.
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