Unable to install grub during Wily installation on brtfs

[Carla Sella]

During install of Wily on my Desktop PC (https://gist.github.com/anonymous/3203c7c5a43a509c0f22), I selected Brtfs as filesystem for my root directory, at the end of the installation got an error message saying "unable to install GRUB in /dev/sda" I am attaching a screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubiquity 2.21.27
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu6
Architecture: amd64
CasperVersion: 1.364
Date: Sat Aug 15 19:34:44 2015
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150815.1)
ProcEnviron:
 TERM=linux
 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)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1485247

[Phillip Susi (psusi)]

Your disk appears to have been partitioned using an ancient partitioning tool that started the first partition only 32k into the disk instead of at the 1 MiB mark, which does not leave enough room for grub. You should repartition the disk to fix this.