installer crashes during grub install.

[Trevor]

while installing the OS everything goes fine until it hits grub2, then it crashes. it says it cannot find target.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.8.12
ProcVersionSignature: Ubuntu 4.2.0-27.32~14.04.1-generic 4.2.8-ckt1
Uname: Linux 4.2.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CasperVersion: 1.340.2
Date: Fri Jul 1 11:16:53 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
LiveMediaBuild: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

Your installation medium contains a mix of trusty, xenian, and kali-rolling. You need to wipe the usb stick before reusing it to install another distro or release.

[ench0 (alexander-enchevich)]

I used a fresh xubuntu 18.04 installation image on a wiped usb stick and still got the same error.