ResultInactive does not seem to work for Action=org.debian.apt.install-or-remove-packages

I can install packages using aptdcon -i via the graphical login.

When logged in via a non graphical local login, or via ssh, the user is unable to install packages with the error:

$ aptdcon -i xclip
The following NEW package will be installed (1):
  xclip
Do you want to continue [Y/n]?y
ERROR: You are not allowed to perform this action.

('system-bus-name', {'name': ':1.194'}): org.debian.apt.install-or-remove-packages

The contents of the file I use to enable this policy are below:

cat /etc/polkit-1/localauthority/50-local.d/10-allow-users-to-install.pkla
[Untrusted Install]
Identity=unix-user:testing
Action=org.debian.apt.install-packages
ResultActive=auth_self
ResultInactive=auth_self

[Untrusted Install or Remove]
Identity=unix-user:testing
Action=org.debian.apt.install-or-remove-packages
ResultActive=auth_self
ResultInactive=auth_self

[Untrusted Update]
Identity=unix-user:testing
Action=org.debian.apt.update-cache
ResultInactive=auth_self
ResultActive=auth_self

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: policykit-1 0.104-1ubuntu1.1
ProcVersionSignature: Ubuntu 3.11.0-19.33~precise1-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Mon Apr 14 18:23:49 2014
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/sh
SourcePackage: policykit-1
UpgradeStatus: No upgrade log present (probably fresh install)