[Bug 1791844] [NEW] grub crashes on install using xubuntu 18.04

[Jose Luis Florez Castro]

Public bug reported:

I was installing xubuntu 18.04 from a live usb and I came out that you
could not install the grub is a new installation but on the partition
where I had installed kubuntu 16.04 I told him to remove it first but
God knows if he did well.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.6
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 10 17:24:47 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
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/1791844

Title:
  grub crashes on install using xubuntu  18.04

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I was installing xubuntu 18.04 from a live usb and I came out that you
  could not install the grub is a new installation but on the partition
  where I had installed kubuntu 16.04 I told him to remove it first but
  God knows if he did well.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14.6
  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 10 17:24:47 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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