Installation crashed due to a failed installation of GRUB onto the following /boot drive: /dev/sdc1

[Nick De Been]

I'm trying to install Ubuntu for my older brother, it installs everything else other then the GRUB bootloader which is required to boot Ubuntu and my other operating system which is Windows 10 Professional x64, this is now serious as I have no idea how to repair the installation and need to be contacted by email so I can speak to someone ear to ear, because if I try to repair the installation, the installer returns an error: ubi-partman failed with exit code 10. Further information can be found in /var/log/syslog.

It then asks me if I want to try the step again before continuing, I click try again and the same error returns, I click continue anyway only to realize that I have not selected a boot drive, which means its going to overwrite everything on my nvme drive which I don't want it to.

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubiquity 19.04.9
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CasperVersion: 1.405
Date: Fri Jul 5 23:49:43 2019
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)