[Bug 1629705] Re: Installing on btrfs raid1 root fails (with /boot partition)

[Phillip Susi]

*** This bug is a duplicate of bug 1354730 ***
    https://bugs.launchpad.net/bugs/1354730

** This bug has been marked a duplicate of bug 1354730
   14.04 grub-install failed: Wrong number of args: mapdevfs <path>

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

Status in grub-installer package in Ubuntu:
  New

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 http://wiki.ubuntuusers.de/Installieren_auf_Btrfs-
  Dateisystem/ this is okay).

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

  ubuntu at ubuntu:~$ lsblk
  NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
  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 at 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 at 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 2.21.63.2
  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)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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