Grub installation failed 18.04 LTS

[Akmal Raza]

While clean installing Ubuntu 18.04 LTS from USB, it prompted me with error "Grub installation failed" message saying "The 'Grub-efi-amd64-signed' package failed to install into /target/. Without the GRUB boot loader, the installed system will not boot.

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
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sat Apr 28 13:30:29 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)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ole Erik Brennhagen (nox+)]

I'm also experiencing this issue. Tried installing Kubuntu 18.04 and Ubuntu 18.04, both suffer from the same error.

However, installing solus and other distros works fine.

[sudarshan (sudarshan22)]

I'm also experiencing this when I tried to install Kubuntu 18.04. I have not tried other distros. Any solutions?

[sudarshan (sudarshan22)]

Screenshot of failure

[Akmal Raza (overtoyou14)]

Finally i installed Ubuntu 17.10 and upgraded it to 18.04, it works.
Install 17.10 open terminal and enter following commands..

$ sudo apt update
$ sudo apt upgrade
$ sudo apt dist-upgrade

$ sudo apt install update-manager-core
$ sudo do-release-upgrade -d