From a Mythbuntu 14.04.1 boot usb with the grubia32.efi switcharoo, select try before install, and install. When finished installing, open a terminal window and enter in the following:
sudo mkdir /mnt/emmc /mnt/emmc/boot sudo mount /dev/mmcblk0p2 /mnt/emmc sudo mount /dev/mmcblk0p1 /mnt/emmc/boot/efi for i in /dev /dev/pts /proc /sys; do sudo mount -B $i /mnt/emmc$i; done sudo cp /etc/resolv.conf /mnt/emmc/etc/resolv.conf sudo chroot /mnt/emmc apt-get update apt-get -y remove grub-efi-amd64 apt-get -y install grub-efi-ia32 cd /boot/efi/EFI cp ubuntu/grubx64.efi ubuntu/grubx64.efi.orig cp ubuntu/grubia32.efi ubuntu/grubx64.efi update-grub2