[Bug 1768931] [NEW] unable to install grub on fresh install

[Till]

Public bug reported:

I created a bootable usb-drive to install Ubuntu on a new computer.

(As far as I know) there has never been anything installed on the hard
drives before. So there should not be any interference from other
operating systems.

The installation works fine, until it tries to install grub. Then it
throws the error "The 'grub-efi-amd64-signed' package failed to install
on /target/."

Please tell me, if you need any more information or something is
unclear. I'm currently a little stressed out, since I have this great
new computer and I want to play around with it but can't get it to
work...

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: Thu May  3 19:52:03 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)

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


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

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https://bugs.launchpad.net/bugs/1768931

Title:
  unable to install grub on fresh install

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I created a bootable usb-drive to install Ubuntu on a new computer.

  (As far as I know) there has never been anything installed on the hard
  drives before. So there should not be any interference from other
  operating systems.

  The installation works fine, until it tries to install grub. Then it
  throws the error "The 'grub-efi-amd64-signed' package failed to
  install on /target/."

  Please tell me, if you need any more information or something is
  unclear. I'm currently a little stressed out, since I have this great
  new computer and I want to play around with it but can't get it to
  work...

  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: Thu May  3 19:52:03 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)

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