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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Quickly reading over the report I would think this is a result of the installer bug I reported as bug #1447167. The problem is that if you configure a system for multipath, it will present each path as an independent drive. And that causes a lot of confusion when a system has data on those and comes up without the multipath tools installed. To the OS this looks like multiple disks having the same filesystem UUIDs which conflict when creating disk-by/... links in /dev. Even worse LVM finds two PVs with the same ID and bails (iirc).
I theory (with a lot knowledge and care) it is possible to install single-path and convert the whole system to multipath later. But frankly I think when the installer was told to enable multipath detect, it should automatically install the tools.

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https://bugs.launchpad.net/bugs/1371634

Title:
  block devices appear twice

Status in curtin package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Invalid
Status in multipath-tools package in Ubuntu:
  New

Bug description:
  $ sudo blkid 
  /dev/sr0: LABEL="Ubuntu-Server 14.04 LTS ppc64el" TYPE="iso9660" 
  /dev/sda2: UUID="795a6e14-ea4e-4718-9e98-c6df3696920c" TYPE="ext4" 
  /dev/sda3: UUID="0a91d81f-6a16-4b96-a92c-11ca8bdc4bf4" TYPE="swap" 
  /dev/sdb2: UUID="1d14c1f3-716f-4fb8-9070-d321b39ffcb3" TYPE="ext4" 
  /dev/sdb3: UUID="9c228177-d65c-4d19-a462-db1891e9781e" TYPE="swap" 
  /dev/sdg2: UUID="795a6e14-ea4e-4718-9e98-c6df3696920c" TYPE="ext4" 
  /dev/sdg3: UUID="0a91d81f-6a16-4b96-a92c-11ca8bdc4bf4" TYPE="swap" 
  /dev/sdh2: UUID="1d14c1f3-716f-4fb8-9070-d321b39ffcb3" TYPE="ext4" 
  /dev/sdh3: UUID="9c228177-d65c-4d19-a462-db1891e9781e" TYPE="swap" 

  I'm not sure what exactly those block devices are (as in if they're
  raided in hardware or they actually represent physical spinning
  disks).  But I do know that writing data to sda causes that data to be
  readable from sdg.

  The same is true:
   sda -> sdg
   sdb -> sdh

  That is what causes those UUIDs to be similar.  Everything is
  functional, you just have to know that if your root device is /dev/sdg
  that you should probably not write data to /dev/sda thinking you can
  use it as a disk.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic ppc64le
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDmesg: [   88.736220] init: plymouth-upstart-bridge main process ended, respawning
  Date: Fri Sep 19 14:31:20 2014
  HibernationDevice: RESUME=UUID=9c228177-d65c-4d19-a462-db1891e9781e
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: root=UUID=1d14c1f3-716f-4fb8-9070-d321b39ffcb3 ro console=hvc0 BOOTIF=01-6c-ae-8b-6a-a0-88 quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.6
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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