grub-install dummy failed

[alexp83]

Error when installing Ubuntu 13.04 (amd64) alongside Windows8 with SecureBoot disabled.

Installation failed at grub-install dummy

The error persists with secure boot enabled. Previously, I get the same error when trying to install Ubuntu12.10 (amd64) alongside Windows8.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubiquity 2.14.6 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CasperVersion: 1.331
Date: Mon Apr 29 17:05:06 2013
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --
LiveMediaBuild: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 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.

[alexp83 (alexp83)]

I tried to install ubuntu 13.04 again with 'fast startup' option disabled and secure boot disabled too. I still get the same bug.
I also tried to install ubuntu on a second hard disk (sdb), forcing ubuntu to boot on sdb. The error persists. Any ideas ?