It crashed during installation. Could not install GRUB

[Marco Pereira]

This is a Windows 10 running in one hard drive and Ubuntu being installed in another. I thought I wouldn't even need GRUB, I would just choose which HD to start with.

In any event it crashed, I suppose it is because it wouldn't install grub on the Windows HD and didn't want to install in the Ubuntu side.

I don't understand the problem properly.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.6 [modified: lib/partman/automatically_partition/question]
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: Sun Mar 18 21:34:34 2018
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

By default grub installs to your primary drive so you can use the grub menu to choose which OS to boot. Your Windows disk is a "dynamic disk", which is not supported. You can have the installer install grub to your second disk along with the rest of Ubuntu, then you will need to go into your bios and reconfigure it to boot one disk or the other whenever you want to switch between Windows and Ubuntu.