Installation of ubuntu failed to install grub2

[Praveen Kumar]

I have an Alienware and I am trying to install Ubuntu alongside Windows 10. Initially i had secure boot off and BIOS in UEFI. Ubuntu gave me a black screen once i hit install ubuntu on the boot loader.
Then I changed the options and added nomodeset to the splash screen.Ubuntu installation started but however failed during the installation of the grub saying "failed to install grub-efi to target".
Tried in secure boot mode on and also off. Please advise. It is getting critical.

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: Thu Sep 15 12:29:58 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity nomodeset quiet splash --
LiveMediaBuild: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

Your installation medium contains a mix of files from Trusty and Xenial. You need to format the usb stick before reusing it for another release.