Public bug reported:

root@ubuntu:/# parted -l
Model: ATA WDC WD5000BPKX-2 (scsi)
Disk /dev/sdb: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 
Number  Start   End     Size    File system  Name  Flags
 1      105MB   1153MB  1049MB  btrfs
 2      1153MB  11.6GB  10.5GB  btrfs
 3      11.6GB  116GB   105GB   btrfs

root@ubuntu:/# mount
/dev/sdb2 on /yourmom type btrfs (rw,relatime,space_cache,subvolid=5,subvol=/)
/dev/sdb1 on /yourmom/boot type btrfs 
(rw,relatime,space_cache,subvolid=5,subvol=/)

root@ubuntu:/# grub-install --root-directory=/yourmom /dev/sdb
Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot 
Partition; embedding won't be possible.
grub-install: error: filesystem `btrfs' doesn't support blocklists.


The 1000M partition is for /boot, the 10G for /, the 100G for /home.
I created the partitions using gparted 0.25.0
The release of Ubuntu is 16.04
I expected grub-install to succeed as there is plenty of space before the first 
partition.


ubuntu@ubuntu:~$ apt-cache policy grub2-common 
grub2-common:
  Installed: 2.02~beta2-36ubuntu3
  Candidate: 2.02~beta2-36ubuntu3
  Version table:
 *** 2.02~beta2-36ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status


I got the install working by using an msdos table and an unformatted
primary partition instead of free space at the beginning of the disk :

(parted) print all
Model: ATA WDC WD5000BPKX-2 (scsi)
Disk /dev/sdb: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 
Number  Start   End     Size    Type      File system  Flags
 1      10.5MB  115MB   105MB   primary                boot
 2      115MB   500GB   500GB   extended
 5      116MB   1165MB  1049MB  logical   btrfs
 6      1166MB  11.7GB  10.5GB  logical   btrfs
 7      11.7GB  117GB   105GB   logical   btrfs

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63 [modified: 
lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
Date: Mon May  9 07:28:51 2016
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper 
initrd=/casper/initrd.lz quiet splash ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 LANGUAGE=fr_CA.UTF-8
 PATH=(custom, no user)
 LANG=fr_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug ubiquity-2.21.63 ubuntu xenial

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https://bugs.launchpad.net/bugs/1579739

Title:
  ubuntu 16.04 install fails at grub install on btrfs

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