Public bug reported:

Installed Ubuntu 14.04 LTS 32bit server from CD.

Install OS on software RAID1 with one hdd disk (degraided raid1).

After reboot system this messages are last and boot stopped:
[    6.531314] md: raid6 personality registered for level 6
[    6.531382] md: raid5 personality registered for level 5
[    6.531427] md: raid4 personality registered for level 4
[    6.535395] md: raid10 personality registered for level 10
done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... done.
mount: mounting /dev/disk/by-uuid/d35b085e-1361-4d78-afd0-60dcdc0a2b81 on /root 
failed: Device or resource busy
Begin: Running /scripts/local-bottom ... done.
done.
Begin: Running /scripts/init-bottom ... done.
[    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
[    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
[    6.195880] usb 2-1: Manufacturer: VMware
[    6.306922] usb 2-2: new full-speed USB device number 3 using uhci_hcd
[    6.435625] usb 2-2: New USB device found, idVendor=0e0f, idProduct=0002
[    6.435671] usb 2-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[    6.435716] usb 2-2: Product: VMware Virtual USB Hub
[    6.436427] hub 2-2:1.0: USB hub found
[    6.436633] hub 2-2:1.0: 7 ports detected
mount: mounting /dev on /root/dev failed: No such file or directory
done.
mount: mounting /sys on /root/sys failed: No such file or directory
mount: mounting /proc on /root/proc failed: No such file or directory
Target filesystem doesn't have requested /sbin/init.
No init found. Try passing init= bootarg.
[    6.440124] hidraw: raw HID events driver (C) Jiri Kosina
[    6.443783] usbcore: registered new interface driver usbhid
[    6.443829] usbhid: USB HID core driver

BusyBox v1.21.1 (Ubuntu 1:1.21.-=1ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

If through boot press "scroll lock" or "Ctrl-S" around the message:
[    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
[    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
[    6.195880] usb 2-1: Manufacturer: VMware

Then loading passes to login:
Ubuntu 14.04.1 LTS ubuntu tty1
ubuntu login:

But, if change /etc/mdadm/mdadm.conf (/dev/md/0 to /dev/md0 and
/dev/md/1 to /dev/md1)

from:
ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1

to:
ARRAY /dev/md0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
ARRAY /dev/md1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1

and run:
update-initramfs -u -k all
then boot loading passes to login:
Ubuntu 14.04.1 LTS ubuntu tty1
ubuntu login:

And after return lines
ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
to config file /etc/mdadm/mdadm.conf, then boot process stop at "(initramfs)".
--- 
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: i386
CurrentDmesg: [   21.192659] init: plymouth-upstart-bridge main process (268) 
killed by TERM signal
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2014-09-20 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release i386 
(20140416.2)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
 Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MDadmExamine.dev.sda:
 /dev/sda:
    MBR Magic : aa55
 Partition[0] :     39061504 sectors at         2048 (type fd)
 Partition[1] :      2877440 sectors at     39063552 (type fd)
MachineType: VMware, Inc. VMware Virtual Platform
Package: mdadm 3.2.5-5ubuntu4.1
PackageArchitecture: i386
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic 
root=UUID=d35b085e-1361-4d78-afd0-60dcdc0a2b81 ro nomdmonddf nomdmonisw
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Tags:  trusty
Uname: Linux 3.13.0-35-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 07/31/2013
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/31/2013:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected mdadm one-disk trusty

** Description changed:

  Installed Ubuntu 14.04 LTS 32bit server from CD.
  
- Install OS on software RAID with one hdd disk (degraided raid).
+ Install OS on software RAID1 with one hdd disk (degraided raid1).
  
  After reboot system this messages are last and boot stopped:
  [    6.531314] md: raid6 personality registered for level 6
  [    6.531382] md: raid5 personality registered for level 5
  [    6.531427] md: raid4 personality registered for level 4
  [    6.535395] md: raid10 personality registered for level 10
  done.
  Begin: Running /scripts/init-premount ... done.
  Begin: Mounting root file system ... Begin: Running /scripts/local-top ... 
done.
  Begin: Running /scripts/local-premount ... done.
  mount: mounting /dev/disk/by-uuid/d35b085e-1361-4d78-afd0-60dcdc0a2b81 on 
/root failed: Device or resource busy
  Begin: Running /scripts/local-bottom ... done.
  done.
  Begin: Running /scripts/init-bottom ... done.
  [    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
  [    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
  [    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
  [    6.195880] usb 2-1: Manufacturer: VMware
  [    6.306922] usb 2-2: new full-speed USB device number 3 using uhci_hcd
  [    6.435625] usb 2-2: New USB device found, idVendor=0e0f, idProduct=0002
  [    6.435671] usb 2-2: New USB device strings: Mfr=0, Product=1, 
SerialNumber=0
  [    6.435716] usb 2-2: Product: VMware Virtual USB Hub
  [    6.436427] hub 2-2:1.0: USB hub found
  [    6.436633] hub 2-2:1.0: 7 ports detected
  mount: mounting /dev on /root/dev failed: No such file or directory
  done.
  mount: mounting /sys on /root/sys failed: No such file or directory
  mount: mounting /proc on /root/proc failed: No such file or directory
  Target filesystem doesn't have requested /sbin/init.
  No init found. Try passing init= bootarg.
  [    6.440124] hidraw: raw HID events driver (C) Jiri Kosina
  [    6.443783] usbcore: registered new interface driver usbhid
  [    6.443829] usbhid: USB HID core driver
  
- 
  BusyBox v1.21.1 (Ubuntu 1:1.21.-=1ubuntu1) built-in shell (ash)
  Enter 'help' for a list of built-in commands.
  
  (initramfs)
- 
  
  If through boot press "scroll lock" or "Ctrl-S" around the message:
  [    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
  [    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
  [    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
  [    6.195880] usb 2-1: Manufacturer: VMware
  
  Then loading passes to login:
  Ubuntu 14.04.1 LTS ubuntu tty1
  ubuntu login:
  
- 
- But, if change /etc/mdadm/mdadm.conf (/dev/md/0 to /dev/md0 and /dev/md/1 to 
/dev/md1)
+ But, if change /etc/mdadm/mdadm.conf (/dev/md/0 to /dev/md0 and
+ /dev/md/1 to /dev/md1)
  
  from:
  ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  
  to:
  ARRAY /dev/md0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  
  and run:
  update-initramfs -u -k all
  then boot loading passes to login:
  Ubuntu 14.04.1 LTS ubuntu tty1
  ubuntu login:
  
  And after return lines
  ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  to config file /etc/mdadm/mdadm.conf, then boot process stop at "(initramfs)".

** Tags added: apport-collected trusty

** Description changed:

  Installed Ubuntu 14.04 LTS 32bit server from CD.
  
  Install OS on software RAID1 with one hdd disk (degraided raid1).
  
  After reboot system this messages are last and boot stopped:
  [    6.531314] md: raid6 personality registered for level 6
  [    6.531382] md: raid5 personality registered for level 5
  [    6.531427] md: raid4 personality registered for level 4
  [    6.535395] md: raid10 personality registered for level 10
  done.
  Begin: Running /scripts/init-premount ... done.
  Begin: Mounting root file system ... Begin: Running /scripts/local-top ... 
done.
  Begin: Running /scripts/local-premount ... done.
  mount: mounting /dev/disk/by-uuid/d35b085e-1361-4d78-afd0-60dcdc0a2b81 on 
/root failed: Device or resource busy
  Begin: Running /scripts/local-bottom ... done.
  done.
  Begin: Running /scripts/init-bottom ... done.
  [    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
  [    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
  [    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
  [    6.195880] usb 2-1: Manufacturer: VMware
  [    6.306922] usb 2-2: new full-speed USB device number 3 using uhci_hcd
  [    6.435625] usb 2-2: New USB device found, idVendor=0e0f, idProduct=0002
  [    6.435671] usb 2-2: New USB device strings: Mfr=0, Product=1, 
SerialNumber=0
  [    6.435716] usb 2-2: Product: VMware Virtual USB Hub
  [    6.436427] hub 2-2:1.0: USB hub found
  [    6.436633] hub 2-2:1.0: 7 ports detected
  mount: mounting /dev on /root/dev failed: No such file or directory
  done.
  mount: mounting /sys on /root/sys failed: No such file or directory
  mount: mounting /proc on /root/proc failed: No such file or directory
  Target filesystem doesn't have requested /sbin/init.
  No init found. Try passing init= bootarg.
  [    6.440124] hidraw: raw HID events driver (C) Jiri Kosina
  [    6.443783] usbcore: registered new interface driver usbhid
  [    6.443829] usbhid: USB HID core driver
  
  BusyBox v1.21.1 (Ubuntu 1:1.21.-=1ubuntu1) built-in shell (ash)
  Enter 'help' for a list of built-in commands.
  
  (initramfs)
  
  If through boot press "scroll lock" or "Ctrl-S" around the message:
  [    6.195744] usb 2-1: New USB device found, idVendor=0e0f, idProduct=0003
  [    6.195789] usb 2-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
  [    6.195835] usb 2-1: Product: VMware Virtual USB Mouse
  [    6.195880] usb 2-1: Manufacturer: VMware
  
  Then loading passes to login:
  Ubuntu 14.04.1 LTS ubuntu tty1
  ubuntu login:
  
  But, if change /etc/mdadm/mdadm.conf (/dev/md/0 to /dev/md0 and
  /dev/md/1 to /dev/md1)
  
  from:
  ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  
  to:
  ARRAY /dev/md0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  
  and run:
  update-initramfs -u -k all
  then boot loading passes to login:
  Ubuntu 14.04.1 LTS ubuntu tty1
  ubuntu login:
  
  And after return lines
  ARRAY /dev/md/0 metadata=1.2 UUID=8f0090f4:8058b740:de4ea3e4:d197046c 
name=ubuntu:0
  ARRAY /dev/md/1 metadata=1.2 UUID=039ff78d:03ed555f:2b050a37:996683f2 
name=ubuntu:1
  to config file /etc/mdadm/mdadm.conf, then boot process stop at "(initramfs)".
+ --- 
+ ApportVersion: 2.14.1-0ubuntu3.4
+ Architecture: i386
+ CurrentDmesg: [   21.192659] init: plymouth-upstart-bridge main process (268) 
killed by TERM signal
+ DistroRelease: Ubuntu 14.04
+ InstallationDate: Installed on 2014-09-20 (0 days ago)
+ InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release i386 
(20140416.2)
+ Lsusb:
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
+  Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ MDadmExamine.dev.sda:
+  /dev/sda:
+     MBR Magic : aa55
+  Partition[0] :     39061504 sectors at         2048 (type fd)
+  Partition[1] :      2877440 sectors at     39063552 (type fd)
+ MachineType: VMware, Inc. VMware Virtual Platform
+ Package: mdadm 3.2.5-5ubuntu4.1
+ PackageArchitecture: i386
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic 
root=UUID=d35b085e-1361-4d78-afd0-60dcdc0a2b81 ro nomdmonddf nomdmonisw
+ ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
+ Tags:  trusty
+ Uname: Linux 3.13.0-35-generic i686
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups:
+  
+ _MarkForUpload: True
+ dmi.bios.date: 07/31/2013
+ dmi.bios.vendor: Phoenix Technologies LTD
+ dmi.bios.version: 6.00
+ dmi.board.name: 440BX Desktop Reference Platform
+ dmi.board.vendor: Intel Corporation
+ dmi.board.version: None
+ dmi.chassis.asset.tag: No Asset Tag
+ dmi.chassis.type: 1
+ dmi.chassis.vendor: No Enclosure
+ dmi.chassis.version: N/A
+ dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/31/2013:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
+ dmi.product.name: VMware Virtual Platform
+ dmi.product.version: None
+ dmi.sys.vendor: VMware, Inc.
+ etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

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https://bugs.launchpad.net/bugs/1371985

Title:
  mdadm raid1 on one disk problem with boot

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