Public bug reported:

during the installation process.
when "Installing the  'grub2' packege..." 
it shows such a warnning:
The' grub-efi-amd64-signed' package failed to install into /target/. Without 
the GRUB boot loader, the installed system will not boot.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.4
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CasperVersion: 1.376.2
Date: Fri Jan  5 19:59:57 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed 
boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug ubiquity-2.21.63.4 ubuntu xenial

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https://bugs.launchpad.net/bugs/1741455

Title:
  GRUB installation failed

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