Tried every thinkable strategies, but to no avail. The bug still hasn't been fixed! :-(

[Gunnar Hjern]

What details are there that wasn't gathered bu the bug-report tool?
I have tried both with the efi-partition that was left by earlier Windows installation, and that which is supposed to be made by the Ubuntu installer itself, and even tried to make one with gparted, and setting both boot and esp flags, but whatever I do, I still end up with this error. Tried at least 10 times this evening! :-(

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.12
ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CasperVersion: 1.394
Date: Sun Jul 14 23:21:38 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)