[Bug 1790433] [NEW] error installing GRUB during installation of Xubuntu 18.04

[Quentin B]

Public bug reported:

During installation of Xubuntu 18.04, the installer crashed and showed me a message saying that Grub couldn't be installed and so the system wouldn't be able to launch.
Package grub-efi-amd64 couldn't be installed in /target/
and when I clicked I was sent to this firefox page to report the crash.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.6 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
Date: Mon Sep  3 05:53:59 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 LC_NUMERIC=C.UTF-8
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-18.04.14.6 xubuntu

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https://bugs.launchpad.net/bugs/1790433

Title:
  error installing GRUB during installation of Xubuntu 18.04

Status in grub-installer package in Ubuntu:
  New

Bug description:
  During installation of Xubuntu 18.04, the installer crashed and showed me a message saying that Grub couldn't be installed and so the system wouldn't be able to launch.
  Package grub-efi-amd64 couldn't be installed in /target/
  and when I clicked I was sent to this firefox page to report the crash.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14.6 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CasperVersion: 1.394
  Date: Mon Sep  3 05:53:59 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  ProcEnviron:
   LANGUAGE=fr_FR.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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