Public bug reported:

Tried to upgrade a 17.04 to 18.04 beta 2, without wiping system.  I
removed all directories on the SSD except home before the install.

Just error aborted on "grub-efi-amd64-signed failed to install"

SSD is formatted as 3 partitions, bios/swap/root

# fdisk -l /dev/sda
Disk /dev/sda: 477 GiB, 512110190592 bytes, 1000215216 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 7E8873B9-CD45-408B-8D2F-C46053AB715B

Device       Start        End   Sectors   Size Type
/dev/sda1     2048       4095      2048     1M BIOS boot
/dev/sda2     4096    4225023   4220928     2G Linux swap
/dev/sda3  4225024 1000215182 995990159 474.9G Linux filesystem

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
Date: Fri Apr 13 10:08:02 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/ubuntu-mate.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu-MATE 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-mate

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  Upgrading 17.10 to 18.04, no disk format

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