This bug is missing log files that will aid in diagnosing the problem.
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apport-collect 1495116

and then change the status of the bug to 'Confirmed'.

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1495116

Title:
  booting with amd64 kernel and completely i386 userland is unstable
  during the system upstart

Status in linux package in Ubuntu:
  Incomplete
Status in upstart package in Ubuntu:
  New

Bug description:
  I wanted to run my 14.10 (Utopic) i386 system with the amd64 kernel,
  so I added that architecture and apt-get-installed the amd64 linux-
  image and linux-image-extra (I learned this was possible thanks to the
  advice at http://askubuntu.com/a/635774/19753 ).

  However, the system upstart procedure more often fails than not: it
  fails by rebooting the computer. (Only around 1 time of 4 is
  successful.)

  A limited system start is (probably, always) successful: either with
  init=/bin/bash parameter to the kernel, or choosing the recovery boot
  option. (However, if I "resume" from the recovery menu, or run "exec
  init" in bash, then the upstart procedure is similarly unstable: it
  usually fails/crashes and reboots.)

  I checked my suspection that  the video driver (nouveau) and X might
  be involved, but that turned out not true: the upstart procedure is
  similarly unstable with "nomodesetting" kernel parameter and without,
  booting into runlevel 3 or the default one.

  Perhaps, I'd like to debug the upstart procedure step-by-step to
  detect which step makes the system crash and reboot, but I don't know
  how. As concerns the timing, the moment the reboot happens can be
  different: it can happen rather early (when I see the message about
  activating the swap) or much later.

  If the system upstart procedure has completed successfully, then it
  works in a quite stable manner and doesn't crash/reboot. So, there is
  something bad specifically during the system upstart procedure.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: upstart 1.13.2-0ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-44.59-generic 3.16.7-ckt14
  Uname: Linux 3.16.0-44-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.5
  Architecture: i386
  CurrentDesktop: Unity
  Date: Sat Sep 12 18:36:28 2015
  InstallationDate: Installed on 2014-06-04 (464 days ago)
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 
(20140204)
  ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.16.0-44-generic 
root=UUID=980299a2-fde5-4f39-acb0-189f528b8485 ro nosplash
  SourcePackage: upstart
  UpgradeStatus: Upgraded to utopic on 2015-09-11 (0 days ago)
  UpstartBugCategory: System
  UpstartRunningSessionVersion: upstart 1.13.2
  UpstartRunningSystemVersion: init (upstart 1.13.2)
  modified.conffile..etc.at.deny: [inaccessible: [Errno 13] Отказано в доступе: 
'/etc/at.deny']
  modified.conffile..etc.cron.daily.upstart: [modified]
  modified.conffile..etc.cups.cups.browsed.conf: [modified]
  modified.conffile..etc.default.apport: [modified]
  modified.conffile..etc.default.cups: [modified]
  modified.conffile..etc.init.d.binfmt.support: [modified]
  mtime.conffile..etc.X11.Xsession.d.99upstart: 2014-09-30T12:21:08
  mtime.conffile..etc.cron.daily.upstart: 2014-09-30T12:27:13
  mtime.conffile..etc.cups.cups.browsed.conf: 2015-09-06T09:29:16.410097
  mtime.conffile..etc.default.apport: 2014-06-05T12:49:10.316398
  mtime.conffile..etc.default.cups: 2015-09-06T09:20:49.891585
  mtime.conffile..etc.init.d.binfmt.support: 2014-09-30T12:21:08
  mtime.conffile..etc.upstart.xsessions: 2014-09-30T12:21:08

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