The USB stick created by newstartup creator on xenial 16.04 does not able to boot with UEFI

[Yung Shen]

Relevant bug #1557894

Step to reproduce:
1. Open Startup Disk Creator from Dash
2. Select 'Source disc image', eg., http://releases.ubuntu.com/16.04/ubuntu-16.04-desktop-amd64.iso
3. Select 'Disc to use'
4. Click 'Make Startup Disk'
5. When finished unplug the USB stick and plug into the UEFI computer you want to boot

Expected result:
USB stick should appears under UEFI boot options

Actual result:
USB stick just created doesn't show up, and not even able to boot via legacy mode.

Additional note:
On the same system with same ISO image, USB stick re-created by unetbootin can be booted into UEFI mode correctly.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: usb-creator-common 0.3.2
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 20 11:41:02 2016
InstallationDate: Installed on 2016-05-03 (77 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: usb-creator
UpgradeStatus: No upgrade log present (probably fresh install)