ubiquity crashed when unable to run grub-install, which I don't want to run anyway

[Arbiel Perlacremaz]

When I install a new system, I do not want the boot process to be modified. So I generally ask grub to be installed in a location where it cannot be installed, to avoid my specific boot sequence to be modified. I run grub-mkconfig to update grub menu in the way I want it to be modified.

Please, insert an option in ubiquity to dismiss grub's installation.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.6
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CasperVersion: 1.376.2
Date: Mon Mar 26 10:54:29 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/amorce/ubuntu-16.04.4-desktop-amd64.iso quiet splash ---
LiveMediaBuild: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

You need to install grub to a hard disk such as /dev/sda, rather than a partition as you did ( /dev/sdb1 ).