[Bug 1464917] Re: reboot hangs at 'Reached target Shutdown'

[ggalli]

I have the same problem with Ubuntu 15.10, fresh install on a Lenovo B50-10: the system got stuck on shutdown or reboot (the last trace on screen, when I press Esc, is "Reached target shutdown").
I've tried waiting a few minutes (at least 10 min), but nothing changed... Only way to power off is to keep pressed power button (I don't think it is a good thing for the pc, but I have no other way to power off it)
Don't even know what to check to debug this (very annoying) issue.

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Title:
  reboot hangs at 'Reached target Shutdown'

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  I rebooted my 15.04 system, and found it hanging indefinitely at the
  plymouth shutdown screen.  Hitting esc to reveal the console showed a
  normal set of shutdown messages, ending with 'Reached target Shutdown'
  (paraphrased from memory).

  The system never rebooted on its own.  I had to use SysRq to finish
  the shutdown.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-7ubuntu6
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  Uname: Linux 3.19.0-20-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Jun 13 11:53:10 2015
  InstallationDate: Installed on 2010-09-24 (1723 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 2306CTO
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-20-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: Upgraded to vivid on 2014-12-06 (189 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET97WW (2.57 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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