Comment 2 for bug 872442

(1) Output of pkexec:

indigojo@ubuntu-desktop:~$ pkexec whoami
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is needed to run `/usr/bin/whoami' as the super user
Authenticating as: Yusuf Smith,,, (indigojo)
Password:
==== AUTHENTICATION COMPLETE ===
root
indigojo@ubuntu-desktop:~$

(2) Output of dpkg:

indigojo@ubuntu-desktop:~$ dpkg -l '*pol*kit*' | grep ^ii
ii gir1.2-polkit-1.0 0.102-1 GObject introspection data for PolicyKit
ii libpolkit-agent-1-0 0.102-1 PolicyKit Authentication Agent API
ii libpolkit-backend-1-0 0.102-1 PolicyKit backend API
ii libpolkit-gobject-1-0 0.102-1 PolicyKit Authorization API
ii libpolkit-qt-1-1 0.99.0-3 PolicyKit-qt-1 library
ii policykit-1 0.102-1 framework for managing administrative policies and privileges
ii policykit-1-gnome 0.102-1ubuntu1 GNOME authentication agent for PolicyKit-1
ii policykit-desktop-privileges 0.7 run common desktop actions without password

I have also just found that KPackageKit tries to do system updates without prompting me for a password, and fails.