UEFI + Secureboot + guided full disk encryption -> new system fail to boot after install.

Fresh install on a physical system.
UEFI (in non legacy mode)
Secureboot ON
NetInstall via PXE

Select 'guided partitioning - LVM+encryption' as disk formatting stage.

Installation goes fine (except for the know problem with GRUB_ENABLE_CRYPTODISK in /etc/default/grub)

Rebooting into the newly installed system, it immediately drop to a GRUB prompt.
Upon investigation, it looks like crypto GRUB modules are not present, preventing GRUB to access the main disk and boot the system.

Install without encryption works fine.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: debian-installer (not installed)
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
Date: Sun Nov 27 05:58:20 2016
EcryptfsInUse: Yes
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
MemoryUsage:
 total used free shared buff/cache available
 Mem: 16291844 197412 15683596 9636 410836 15807000
 Swap: 16629244 0 16629244
ProcEnviron:
 LANG=en_IE.UTF-8
 TERM=linux
 LANGUAGE=en_IE:en
 PATH=(custom, no user)
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-26-generic.efi.signed root=/dev/mapper/hostname--vg-root ro splash quiet vt.handoff=7
SourcePackage: debian-installer
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/18/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.70
dmi.board.name: N3700-ITX
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.70:bd04/18/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnN3700-ITX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.