Public bug reported:

Hi,

I had previously installed Ubuntu 16.0 LTS on my system along with
Windows 10. Now I wanted to upgrade to ubuntu 18.0 LTS which I tried to
install via USB. Now while Installing I selected the 2nd option called
"Delete Ubuntu 16 & reinstall" which supposedly should delete the older
version & install the newer version of Ubuntu, i.e. Ubuntu 18.0 LTS.

Now I get stuck on the "Grub Install" phase & the installer crashes. I
tried this multiple times & get the same error.

Also please note that on removing the USB & rebooting the system, I am
stuck on the "grub rescue" screen. I also get this error which states
that the "i386-pc/boot/grub/normal.mod not found" And after going
through a couple of solutions, I had tried running the commands but
still no success.

Please help me out as I am badly stuck in this grub rescue screen & not
able to install the OS (nor am I boot into Windows 10).

Looking forward to hearing from you at the earliest.

Thanks a lot in advance.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
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
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 26 00:15:42 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed 
boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=en_IN
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 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 ubuntu

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https://bugs.launchpad.net/bugs/1783627

Title:
  Ubuntu Installer Crashes every time on Grub Insall Screen

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