ubquity on UEFI: "Executing 'grub-install /dev/mmcblk0' failed. This is a fatal error."

[James Perkins]

First install attempt of Ubuntu 15.04 on Quantum Byte PC, which supports UEFI boot only.
15.04 x86-64 install image boots off USB thumb drive without issue (after /EFI/BOOT/BIOSia32.EFI was added to filesystem).
Have tried zeroing the device contents 'dd if=/dev/zero of=/dev/mmcblk0 bs=128k' prior to install.
Unable to get past this.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.25
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CasperVersion: 1.360
Date: Thu Jul 30 15:00:08 2015
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Patrick Callahan (patrickcallahan42)]

I got the same error with Ubuntu 15.10 64bit.