Problem installing grub-amd64-efi stuff when installing ubuntu in dual boot with windows on the same SSD

[nicola.covallero]

The poroblem appear when installing Ubuntu 18 in dual boot on a SSD where windows 10 is also installed. Specifically, it cannot install package grub-efi-amd64-signed saying that it failed to install such a package into / target /. I tried to install ubuntu in a single partition as root /.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sat Jul 21 16:18:55 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.