[Bug 1304532] [NEW] Ubuntu hangs on shutdown/reboot

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Xubuntu hangs on shutdown and reboot on Dell D430 laptop
even with live USB boot

13.10 works fine

got 2 errors

1) MomemManager did't terminated correctly
2) mount / is busy

screnshot in attach

changing apci=force reboot=force and releated kernel option will not
help

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: modemmanager 1.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Apr  8 20:21:25 2014
InstallationDate: Installed on 2014-04-07 (0 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
SourcePackage: modemmanager
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug trusty
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Ubuntu hangs on shutdown/reboot
https://bugs.launchpad.net/bugs/1304532
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