[Bug 1767567] [NEW] Said "grub-efi-amd64-signed" package failed to install into /target/." - Alongside with Ubuntu 17.10. New to Ubuntu

[SawNwe]

Private bug reported:

Trying to install Xubuntu 18.04 LTS alongside with Ubuntu 17.10
HP Pavilion 15 Sleekbook

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
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 Apr 28 10:12:55 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic ubiquity-18.04.14 xubuntu

** Information type changed from Public to Private

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https://bugs.launchpad.net/bugs/1767567

Title:
  Said "grub-efi-amd64-signed" package failed to install into /target/."
  - Alongside with Ubuntu 17.10. New to Ubuntu

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Trying to install Xubuntu 18.04 LTS alongside with Ubuntu 17.10
  HP Pavilion 15 Sleekbook

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14
  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 Apr 28 10:12:55 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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