[Bug 1770907] Re: Grub failed to install. I've tried twice to fix the issue, although I don't know why its happening.

[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/1770907

Title:
  Grub failed to install. I've tried twice to fix the issue, although I
  don't know why its happening.

Status in grub-installer package in Ubuntu:
  New

Bug description:
  All it said was "grub-efi-amd64-signed-64" failed to install into /target/. Without the grub, the system will not boot. 
  All I did was upgrade from 16.04 LTS to 18.04. I was going to reinstall because Python was giving me problems.
  Because of this, I am unable to boot into Windows too.
  Please help me fix this issue.
  Thank you!

  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
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 13 06:45:54 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   LANGUAGE=en_IN
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_IN
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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