can't install grub signed on an luks partition (swap as well) on efi machine with windows 10

[Philippe Loctaux]

screenshot of the error: https://plus.google.com/+PhilippeLoctaux5862/posts/KUTvSDyLJVn

Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial

I excepted the install to work, it did work 2 days ago

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
Date: Mon Jun 20 13:31:20 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Manfred Hampl (m-hampl)]

From UbiquitySyslog.txt

grub-install: error: attempt to install to encrypted disk without cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file `/etc/default/grub'..

[Philippe Loctaux (loctauxphilippe)]

Should I edit /etc/default/grub on the install disk, or in the live session?

[Philippe Loctaux (loctauxphilippe)]

that didn't work :(

[Manfred Hampl (m-hampl)]

Bug #1278114
Try with GRUB_ENABLE_CRYPTODISK=y

The whole bug seems identical to Bug #1507220