Public bug reported:

After updating ubuntu the other day a number of things broke likely
related to policykit errors I'm seeing in syslog:

Jun  5 11:47:01 neuromancer dbus[792]: [system] Activating service 
name='org.freedesktop.PolicyKit1' (using servicehelper)
Jun  5 11:47:01 neuromancer dbus[792]: [system] Activated service 
'org.freedesktop.PolicyKit1' failed: Cannot launch daemon, file not found or 
permissions invalid

The issues I'm seeing after the update are:
* grub no longer shows up when booting
* login names do not show up in lightdm, I have to type them
* I can no longer login with gnome-shell, it hangs showing only the background
* Unity works but with problems
** I see [Invalid UTF-8] as the title of the login menu.
** My secondary drive is not showing up
** User accounts UI doesn't work (likely do to policy kit not working)

$ lsb_release -rd
Description:    Ubuntu 12.04 LTS
Release:        12.04

$ apt-cache policy policykit-1
policykit-1:
  Installed: 0.104-1ubuntu1
  Candidate: 0.104-1ubuntu1
  Version table:
 *** 0.104-1ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     0.104-1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

$ ll /usr/lib/policykit-1/polkitd
-rwxr-xr-x 1 root root 14896 May 17 00:40 /usr/lib/policykit-1/polkitd*

$ ps -ef | grep kit
root      1230     1  0 11:46 ?        00:00:00 /usr/sbin/console-kit-daemon 
--no-daemon
rtkit     1379     1  0 11:47 ?        00:00:00 /usr/lib/rtkit/rtkit-daemon

$ dpkg -l | grep polkit
ii  gir1.2-polkit-1.0                      0.104-1ubuntu1                       
   GObject introspection data for PolicyKit
ii  libgksu-polkit0                        0.0.2-2.1ubuntu1                     
   simple gobject-based API to run programs as root
ii  libpolkit-agent-1-0                    0.104-1ubuntu1                       
   PolicyKit Authentication Agent API
ii  libpolkit-backend-1-0                  0.104-1ubuntu1                       
   PolicyKit backend API
ii  libpolkit-gobject-1-0                  0.104-1ubuntu1                       
   PolicyKit Authorization API
ii  libpolkit-gobject-1-dev                0.104-1ubuntu1                       
   PolicyKit Authorization API - development files

$ dpkg -l | grep policykit
ii  policykit-1                            0.104-1ubuntu1                       
   framework for managing administrative policies and privileges
ii  policykit-1-gnome                      0.105-1ubuntu3                       
   GNOME authentication agent for PolicyKit-1
ii  policykit-desktop-privileges           0.10                                 
   run common desktop actions without password

** Affects: policykit-1 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1009177

Title:
  Warning: PolicyKit call failed: Cannot launch daemon, file not found
  or permissions invalid

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