Installer fails to instal GRUB in HyperV VM

[PJD]

For some reason Ubuntu GNOME doesn't seem to like HyperV. Previous versions of Ubuntu would complete install, but would not successfully boot. 17.04 yells every time I attempt to install GRUB. Vanilla/Unity Ubuntu has been installed before without issue.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: ubiquity 17.04.9
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CasperVersion: 1.380
Date: Thu Apr 13 14:31:56 2017
InstallCmdLine: file=/cdrom/preseed/ubuntu-gnome.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
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)