The package grub-efi-amd64-signed could not be installed in /target/- I have pictures of the paritionment I did, and the messages.

[Jean-francois Garceau]

I have images of the partitioning and bug message

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.7 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-lowlatency 4.15.18
Uname: Linux 4.15.0-29-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CasperVersion: 1.376.2
Date: Mon Feb 18 21:24:24 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-Studio 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
ProcEnviron:
 LANGUAGE=fr_CA.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_CA.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)