installing as second os with existing windows 10 insecure boot uefi

[travis highley]

created studio live USB with rufus in windows 10. the usb would boot UEFI but not with secure boot.

I disabled secure boot and it installed ok, until this grub install error.

will try booting into it and repairing grub there

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
Uname: Linux 4.15.0-20-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sun Oct 14 09:29:19 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper toram ---
LiveMediaBuild: Ubuntu-Studio 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)