[Bug 1770893] [NEW] ubuntu 18.04 installer failled to install grub

[مالك ب]

Public bug reported:

Hello
I boot from live usb ubuntu 18.04, choosing "Try ubuntu without installing".
It works well. Then I click on "Install Ubuntu 18.04 LTS" on desktop to start the installation. after finishing all options and creating and choosing partitions for the installation, the installation start, and after few minutes, a window appear signalling that the grub installation failed, and suggest me to send this report error.
What I expect: install ubuntu 18.04.
What happened instead: the installation fail and stop.

lsb_release -rd
Description:	Ubuntu 18.04 LTS
Release:	18.04

ubuntu at ubuntu:/$ apt-cache policy 'ubiquity'
ubiquity:
  Installed: 18.04.14
  Candidate: 18.04.14
  Version table:
 *** 18.04.14 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

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: Sat May 12 20:05:18 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/1770893

Title:
  ubuntu 18.04 installer failled to install grub

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Hello
  I boot from live usb ubuntu 18.04, choosing "Try ubuntu without installing".
  It works well. Then I click on "Install Ubuntu 18.04 LTS" on desktop to start the installation. after finishing all options and creating and choosing partitions for the installation, the installation start, and after few minutes, a window appear signalling that the grub installation failed, and suggest me to send this report error.
  What I expect: install ubuntu 18.04.
  What happened instead: the installation fail and stop.

  lsb_release -rd
  Description:	Ubuntu 18.04 LTS
  Release:	18.04

  ubuntu at ubuntu:/$ apt-cache policy 'ubiquity'
  ubiquity:
    Installed: 18.04.14
    Candidate: 18.04.14
    Version table:
   *** 18.04.14 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  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: Sat May 12 20:05:18 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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