Os installation fails: grub failed to install on /dev/sda

[Felix Kuehling]

I tried installing a daily build of 16.04. Fatal error during installation: grub failed to install on /dev/sda.

I used custom partition setup to format an existing partition as / (btrfs) and mounting another existing partition as /home (ext4). I've never tried btrfs as a root filesystem before, but I was feeling adventurous. The installer gave me no indication that there may be problems with btrfs root filesystems, but I'll try again with / as ext4.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.44 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-6.21-generic 4.4.1
Uname: Linux 4.4.0-6-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CasperVersion: 1.367
Date: Sun Feb 21 18:36:33 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160219)
ProcEnviron:
 LANGUAGE=en_CA.UTF-8
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Felix Kuehling (fxkuehl)]

Installation completed when root as /ext4. Haven't booted into the installed OS yet. Fingers crossed ...

[Phillip Susi (psusi)]

Your disk was partitioned using an ancient partitioning tool that did not leave enough room before the start of the first partition to install grub when using btrfs as a root filesystem. You will need to re-partition the disk which should not start the first partition until the 1 mb mark, leaving plenty of room for grub.