Sausy grub-efi amd64 signed package failed to install into /target/

[Anass Eljondy]

setup failed to install grub package, i don't know why. is it because windows 7 on dual boot isn't efi compatible?

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubiquity 2.15.26
ProcVersionSignature: Ubuntu 3.11.0-11.4-lowlatency 3.11.3
Uname: Linux 3.11.0-11-lowlatency x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CasperVersion: 1.336ubuntu1
Date: Fri Feb 7 21:42:15 2014
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper quiet splash --
LiveMediaBuild: Ubuntu-Studio 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Daniel Ye (yerunfa)]

while installing ubuntu 18.04 beta2 , the same error appears.

[Malachi de AElfweald (malachid)]

Just had this happen twice on today's bionic iso