[Bug 1766122] Re: fresh install of Lubuntu 18.04 beta 64bit desktop - option for overwriting existing Ubuntu 16.04 installation selected - install fails with warning about grub

[dino99]

*** This bug is a duplicate of bug 1767703 ***
    https://bugs.launchpad.net/bugs/1767703

** This bug has been marked a duplicate of bug 1767703
   Calling 'apt-install grub-efi-amd64-signed' failed

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https://bugs.launchpad.net/bugs/1766122

Title:
  fresh install of Lubuntu 18.04 beta 64bit desktop - option for
  overwriting existing Ubuntu 16.04 installation selected - install
  fails with warning about grub

Status in grub-installer package in Ubuntu:
  Confirmed

Bug description:
  install fails with warning message

  paket grub-efi-amd64-signed konnte nicht in /target/ installiert
  werden

  package grub-efi-amd64-signed couldn't be installed into /target/

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.4
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.393
  Date: Sun Apr 22 18:24:51 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/lubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180405)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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