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[Stephen Daniel Hill <steve.d.hill.uk@xxxxxxxxxxxxxx>]

I have this bug too...some observations:

* lightdm-gtk-greeter runs at 100% CPU.
   Ctrl-Alt-F1, login, run 'top'
* if I click left or right mouse button, the login screen appears and CPU usage goes back to normal.

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https://bugs.launchpad.net/bugs/1415256

Title:
  Errors entering single-user mode; hang going back to multiuser

Status in upstart package in Ubuntu:
  Confirmed

Bug description:
  Several wrong-looking messages appear when entering single-user mode,
  and when ^D is typed to exit the single-user shell, the system hangs trying to resume multi-user mode
  (the graphical login never apperas, nor does the virtual-terminal login prompt).

  I observed this testing with virtualbox.  Haven't tried bare metal.

  I will attach two screenshots, one showing the entry into single-user mode, the second showing the attempted exit.
  But the bits which seemed relevant are reproduced below;

  STEPS TO REPRODUCE:

  1.  Log in as root from a virtual console (in virtualbox: <host>-F1 and log in)
  2.  $ shutdown now  # documented to enter single-user mode

  /lib/init/init-d-script: 2: /etc/default/whoopsie: [General]: not found
  ...
  ModemManager ... Caught signal, shutting down...
  ModemManager ... Could not acquire the 'org.freedesktop.Modemmanger1' service name

  3. When prompted, enter root password
  ...
  4. ^D (or type 'exit')
  ...
  /lib/init/init-d-script: 2:  /etc/default/shoopsie: [General]: not found
  systemd-logind: Failed to start user service: Unknown unit: user@108.service
  systemd-logind: Failed to start user service: Unknown unit: user@0.service
  systemd-logind: Failed to start user service: Unknown unit: user@1000.service
  * Starting shoopsie shoopsie    [fail]
  (HANGS)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: upstart 1.13.2-0ubuntu7
  ProcVersionSignature: Ubuntu 3.18.0-11.12-generic 3.18.3
  Uname: Linux 3.18.0-11-generic x86_64
  ApportVersion: 2.15.1-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Jan 27 15:46:46 2015
  InstallationDate: Installed on 2015-01-02 (25 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150102)
  ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.18.0-11-generic root=UUID=96d674cd-12fb-4ad1-8d76-cffb545e6256 ro quiet splash vt.handoff=7
  SourcePackage: upstart
  UpgradeStatus: No upgrade log present (probably fresh install)
  UpstartBugCategory: System
  UpstartRunningSessionVersion: upstart 1.13.2
  UpstartRunningSystemVersion: init (upstart 1.13.2)

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