Public bug reported:

Installing to hybrid btrfs raid.  Adaptec 51245, 4x 2 ssd raid1
(/dev/sda-d).  mkfs.btrfs -m raid10 -d raid0 /dev/sda-e.

Install fails at some point.  Live session is very slow.  Typing and
mouse movements are delayed.

Hardware:
ASUS X99-A USB 3.1
i7-5930K
32GiB DDR4 RAM
8x SAMSUNG 840 Pro 256GB
2x AMD FirePro W5000

Numerous devices on pci@0000 reported as unclaimed.  This was not an
issue prior to 15.04.  Even 14.04 with 3.19 kernel was without this
issue.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.25
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CasperVersion: 1.360
Date: Sat Sep 19 17:03:27 2015
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed 
boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.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-2.21.25 ubuntu vivid

** Attachment added: "lshw.txt"
   https://bugs.launchpad.net/bugs/1497647/+attachment/4469063/+files/lshw.txt

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https://bugs.launchpad.net/bugs/1497647

Title:
  Ubiquity crashes during OS install

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