[Bug 1766345] [NEW] grub-installer crashes ubiquity on 18.04 ubuntu installation

[Kaltxi]

Public bug reported:

Was trying to install 18.04 ubuntu, but the installation crashed on grub installation.
Setup:
HDD 1TB (sda): [ext4 root ubuntu partition, 100 GB (sda1)][400 GB unallocated space][400 GB NTFS data (sda2)]
SSD 200 GB (sdb): [win10 (sdb1)]
installation was going to sda1 with boot device sda.

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: 1.392
Date: Mon Apr 23 23:21:10 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
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-18.04.4 ubuntu

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https://bugs.launchpad.net/bugs/1766345

Title:
  grub-installer crashes ubiquity on 18.04 ubuntu installation

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Was trying to install 18.04 ubuntu, but the installation crashed on grub installation.
  Setup:
  HDD 1TB (sda): [ext4 root ubuntu partition, 100 GB (sda1)][400 GB unallocated space][400 GB NTFS data (sda2)]
  SSD 200 GB (sdb): [win10 (sdb1)]
  installation was going to sda1 with boot device sda.

  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: 1.392
  Date: Mon Apr 23 23:21:10 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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