'grub-efi-amd64-signed' (almost*) always fails. I only experience this with Budgie 18.04 installer, but have had success mounting an additional logical /boot partition in the past. will try again..

[Zach]

'grub-efi-amd64-signed' (almost*) always fails. I only experience this with Budgie 18.04 iso installer - other bionic install images work fine. I have had success in the past; I believe by making a logical /boot partition as fix in the past. will try again..
.. also, I apologize if this hasn't been in a desirable format, I'm a bit newbish. Thank you for a wonderful distro.

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: Budgie
Date: Fri Jun 8 07:52:17 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-budgie.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-Budgie 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)