`grub-install /dev/sda` error when installing to empty /dev/sdb drive

[Benjamin Sims]

I'm attempting to install Kubuntu onto an empty drive of mine, which is called /dev/sdb, but when trying to install Kubuntu to that drive it'll always have an error running the command `grub-install /dev/sda`.

I've had this error with 18.04 and 16.04.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.7 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CasperVersion: 1.376.2
CurrentDesktop: KDE
Date: Tue Jan 1 00:18:14 2019
InstallCmdLine: file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Kubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)