Public bug reported:

Partition setup was a luks partition with an existing home directory,
which I'd unlocked prior to starting ubiquity (otherwise it wouldn't
even find the partition)

Bootloader install partition was an efi system partition

This section of syslog looks relevant, looks like it couldn't handle the
encrypted disk

Apr 11 10:02:32 kubuntu ubiquity: grub-install: error: attempt to install to 
encrypted disk without cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=y' in 
file `/etc/default/grub'.
Apr 11 10:02:32 kubuntu ubiquity: dpkg: error processing package shim-signed 
(--configure):
Apr 11 10:02:32 kubuntu ubiquity:  subprocess installed post-installation 
script returned error exit status 1
Apr 11 10:02:32 kubuntu ubiquity: Setting up grub-efi-amd64-signed 
(1.85.3+2.02~beta3-4ubuntu7.3) ...
Apr 11 10:02:32 kubuntu ubiquity: Installing for x86_64-efi platform.
Apr 11 10:02:33 kubuntu ubiquity: File descriptor 4 (/dev/nvme0n1p1) leaked on 
vgs invocation. Parent PID 4675: grub-install
Apr 11 10:02:33 kubuntu ubiquity: File descriptor 4 (/dev/nvme0n1p1) leaked on 
vgs invocation. Parent PID 4675: grub-install
Apr 11 10:02:33 kubuntu ubiquity: grub-install: error: attempt to install to 
encrypted disk without cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=y' in 
file `/etc/default/grub'.


Also this bit might be useful as well

updates/main amd64 linux-headers-generic amd64 4.13.0.38.41 [2290 B]
Apr 11 10:03:08 kubuntu /plugininstall.py: Exception during installation:
Apr 11 10:03:08 kubuntu /plugininstall.py: Traceback (most recent call last):
Apr 11 10:03:08 kubuntu /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 1721, in <module>
Apr 11 10:03:08 kubuntu /plugininstall.py:     install.run()
Apr 11 10:03:08 kubuntu /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 61, in wrapper
Apr 11 10:03:08 kubuntu /plugininstall.py:     func(self)
Apr 11 10:03:08 kubuntu /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 227, in run
Apr 11 10:03:08 kubuntu /plugininstall.py:     self.configure_bootloader()
Apr 11 10:03:08 kubuntu /plugininstall.py:   File 
"/usr/share/ubiquity/plugininstall.py", line 971, in configure_bootloader
Apr 11 10:03:08 kubuntu /plugininstall.py:     "GrubInstaller failed with code 
%d" % ret)
Apr 11 10:03:08 kubuntu /plugininstall.py: 
ubiquity.install_misc.InstallStepError: GrubInstaller failed with code 141
Apr 11 10:03:08 kubuntu /plugininstall.py: 
Apr 11 10:03:08 kubuntu ubiquity: umount: /target: target is busy.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubiquity 17.10.10
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CasperVersion: 1.387
Date: Wed Apr 11 20:06:47 2018
LiveMediaBuild: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
ProcEnviron:
 LANGUAGE=
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1762988

Title:
  Ubiquity crashes at the bootloader installation phase

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