Crashed after finishing 17.10 daily build installation onto hard drive

[Jesse]

This Report Bug issue came up after I finished the set-up for Ubuntu 17.10 daily build (build date 2017.09.06), 64-bit.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubiquity 17.10.4
ProcVersionSignature: Ubuntu 4.12.0-12.13-generic 4.12.8
Uname: Linux 4.12.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CasperVersion: 1.384
Date: Tue Sep 5 22:13:48 2017
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170905)
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Jean-Baptiste Lallement (jibel)]

Sep 6 05:13:20 ubuntu ubiquity: Creating config file /etc/default/grub with new version
Sep 6 05:13:21 ubuntu ubiquity: Installing for x86_64-efi platform.
Sep 6 05:13:23 ubuntu ubiquity: grub-install: error: cannot open `/boot/efi/EFI/BOOT/BOOTX64.efi': Is a directory.
Sep 6 05:13:23 ubuntu ubiquity: Failed: grub-install --target=x86_64-efi
Sep 6 05:13:23 ubuntu ubiquity: WARNING: Bootloader is not properly installed, system may not be bootable
Sep 6 05:13:24 ubuntu ubiquity: Setting up grub-efi-amd64-signed (1.84+2.02~beta3-4ubuntu6) ...
Sep 6 05:13:25 ubuntu ubiquity: Installing for x86_64-efi platform.
Sep 6 05:13:26 ubuntu ubiquity: grub-install: error: cannot open `/boot/efi/EFI/BOOT/BOOTX64.efi': Is a directory.
Sep 6 05:13:26 ubuntu ubiquity: dpkg: error processing package grub-efi-amd64-signed (--configure):
Sep 6 05:13:26 ubuntu ubiquity: subprocess installed post-installation script returned error exit status 1

[Phillip Susi (psusi)]

At the point where this fails, can you please run ls -lR /boot/efi/ and post the output?

[Launchpad Janitor (janitor)]

[Expired for grub-installer (Ubuntu) because there has been no activity for 60 days.]