Installing on btrfs raid1 root fails (with /boot partition)

Bug #1629705 reported by Benjamin Tegge on 2016-10-02
This bug affects 1 person
Affects Status Importance Assigned to Milestone
grub-installer (Ubuntu)

Bug Description

Similar to #1629576, but now with a boot partition after the Fedora Workstation installer told me that I do need a boot partition.

I created a mirrored btrfs volume in a VM for testing before installing:

sudo mkfs.btrfs -f -m raid1 -d raid1 /dev/sda4 /dev/sdb4

I then tried to install with ubiquity to one of the btrfs partitions (according to this is okay).

Output of lsblk after the installer crashed (a btrfs install is supposed to create necessary subvolumes):

ubuntu@ubuntu:~$ lsblk
sda 8:0 0 10G 0 disk
├─sda1 8:1 0 100M 0 part /target/boot/efi
├─sda2 8:2 0 500M 0 part /target/boot
├─sda3 8:3 0 999M 0 part [SWAP]
└─sda4 8:4 0 8.4G 0 part /target/home
sdb 8:16 0 10G 0 disk
├─sdb1 8:17 0 100M 0 part
├─sdb2 8:18 0 500M 0 part
├─sdb3 8:19 0 999M 0 part [SWAP]
└─sdb4 8:20 0 8.4G 0 part
sr0 11:0 1 1.4G 0 rom /cdrom
loop0 7:0 0 1.4G 1 loop /rofs

ubuntu@ubuntu:~$ sudo btrfs filesystem show
Label: none uuid: f45656e6-5d73-45a6-aaa5-37b0af54ece8
 Total devices 2 FS bytes used 3.75GiB
 devid 1 size 8.44GiB used 5.01GiB path /dev/sda4
 devid 2 size 8.44GiB used 5.01GiB path /dev/sdb4

ubuntu@ubuntu:~$ sudo btrfs subvolume list /target/
ID 258 gen 292 top level 5 path @
ID 259 gen 75 top level 5 path @home

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CasperVersion: 1.376
Date: Sun Oct 2 22:12:11 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
 PATH=(custom, no user)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

Benjamin Tegge (livewirebt) wrote :
description: updated
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