Public bug reported:

I was upgrading from 16.04 to 18.04. The main reason for upgrade is
constant problems with WI-FI in 16.04.

I have a UEFI system, hence, in my view, GRUB is not required. However,
Ubuntu installs GRUB by default. I had the GRUB installed from 16.04. I
had tried removing the GRUB using CMD commands before trying to install
18.04. However, when I rebooted the system, GRUB greeted me to 16.04.

I started 18.04 installation as an upgrade to 16.04. The installer
failed to install GRUB.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.4 [modified: 
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
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr  6 13:29:03 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed 
boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403)
 PATH=(custom, no user)
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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  Grub2 failed to install

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