Installer fails to install/find existing efi partition when manual paritioning selected. No option to manually set efi in the partioner

[Joel Wirāmu Pauling (aenertia)]

When the default "Install alongside windows boot manager" option is unchecked and manual paritioning is done via "something else" option in the ubuntu installer. There is no way to easily select the existing efi parition as the grub install location.

If no selection is made Ubuntu should default to installing along side existing EFI partitions (probably if there are multiple on disk in all of them). Instead of failing at grub installation.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.25 [modified: lib/partman/automatically_partition/question]
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: Wed Jul 8 20:16:28 2015
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 LANGUAGE=en_NZ.UTF-8
 PATH=(custom, no user)
 LANG=en_NZ.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)