Lucid server is supported until 2015 and I would tend to see this as a
server issue. So since this can be reduced to md problems, the fact that
/proc/mdstat is empty would lead to assume that something during the
assembly failed completely. Despite the weird output of mdadm --examine
(sounds really like some tool failure back in lucid) does looking at the
other mirror half produce the same/similar output (assume that would be
on sdc)?

Maybe also remove the "quiet" command line option in grub before booting
(if that still hides too much output, experiment with removing splash as
well, though I think to remember that may cause the question about
skipping or manual recovery not to appear on screen on some older
releases (thoug not remembering which one)).

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https://bugs.launchpad.net/bugs/1209423

Title:
  [STAGING] 2.6.32-47 kernel update on 10.04 breaks software RAID at
  boot

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After update from 2.6.32-46 to 2.6.32-47 one of the md arrays does not
  start anymore at boot time. The RAID 1 md0 now causes message
  "Continue to wait; or Press S to skip mounting or M for manual
  recovery" at boot. I used "S" to create this report as requested in a
  similar bug report
  (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1190295) by user
  "penalvch"

  Booting back into 2.6.32-46 the md devices are correctly set up and
  the system boots normally. See the linked bug for further details,
  such as:

  The array that does not start anymore has the following config:
  level=raid1 metadata=1.2 num-devices=2

  While a second array with metadata=1.0 seems to be recognized and
  started correctly.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-50-generic 2.6.32-50.112
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-50.112-generic 2.6.32.61+drm33.26
  Uname: Linux 2.6.32-50-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alan       1991 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6220000 irq 22'
     Mixer name : 'Realtek ALC888'
     Components : 'HDA:10ec0888,80860034,00100202'
     Controls      : 28
     Simple ctrls  : 16
  Date: Thu Aug  8 02:01:09 2013
  HibernationDevice: RESUME=UUID=b1649a13-fffd-4e98-b42b-a5e9ea98f9fc
  InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release amd64 
(20120214.2)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-50-generic 
root=UUID=e69dddfa-14a0-499f-9267-edca27fbd7a4 ro quiet splash
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.14
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  StagingDrivers: r8192s_usb
  Title: [STAGING]
  dmi.bios.date: 04/19/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: WBIBX10J.86A.0293.2010.0419.1819
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP55WB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE64798-207
  dmi.chassis.type: 2
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrWBIBX10J.86A.0293.2010.0419.1819:bd04/19/2010:svn:pn:pvr:rvnIntelCorporation:rnDP55WB:rvrAAE64798-207:cvn:ct2:cvr:

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