Tried to install on brtfs partition new installation of ubuntu13.04

[mjreged]

ubuntu grub-installer: info: Installing grub on 'dummy'
Apr 15 15:14:26 ubuntu grub-installer: info: grub-install does not support --no-floppy
Apr 15 15:14:26 ubuntu grub-installer: info: Running chroot /target grub-install --force
Apr 15 15:14:26 ubuntu grub-installer: Path `/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.
Apr 15 15:14:26 ubuntu grub-installer: error: Running 'grub-install --force failed.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubiquity 2.14.1 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
CasperVersion: 1.330
Date: Mon Apr 15 11:15:16 2013
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
LiveMediaBuild: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1)
MarkForUpload: True
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)