dash does not terminate at computer shutdown

[Alaric Cundy]

PC will not shut down or restart 14.04

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: dash 0.5.7-4ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-46.79-generic 3.13.11-ckt15
Uname: Linux 3.13.0-46-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: i386
Date: Thu Mar 12 11:12:32 2015
ExecutablePath: /bin/dash
InstallationDate: Installed on 2014-10-13 (150 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
OmitPids: 15166 500 15172 435 15275 500 15172 435 15275
ProcEnviron:
 LC_COLLATE=C
 PATH=(custom, no user)
 LC_NUMERIC=C
 LANG=en_GB.UTF-8
SourcePackage: dash
Title: dash does not terminate at computer shutdown
UpgradeStatus: Upgraded to trusty on 2014-11-21 (111 days ago)