unity-2d 5.6.0-ubuntu2 has no panels, just the desktop

Here is the content of my ~/.xsession-errors after a login.

$ dpkg -l | grep unity
ii gir1.2-unity-5.0 5.6.0-0ubuntu1 GObject introspection data for the Unity library
ii libmeanwhile1 1.0.2-4build1 open implementation of the Lotus Sametime Community Client protocol
ii libunity-2d-private0 5.6.0-0ubuntu2 Unity 2D shared library
ii libunity-core-5.0-5 5.6.0-0ubuntu1 Core library for the Unity interface.
ii libunity-misc4 4.0.4-0ubuntu2 Miscellaneous functions for Unity - shared library
ii libunity9 5.6.0-0ubuntu1 binding to get places into the launcher - shared library
ii unity-2d 5.6.0-0ubuntu2 Unity interface for non-accelerated graphics cards
ii unity-2d-panel 5.6.0-0ubuntu2 Unity 2D Panel
ii unity-2d-shell 5.6.0-0ubuntu2 Dash and Launcher for the Unity 2D environment
ii unity-2d-spread 5.6.0-0ubuntu2 Unity 2D Spread
ii unity-asset-pool 0.8.23-0ubuntu1 Unity Assets Pool
ii unity-common 5.6.0-0ubuntu1 Common files for the Unity interface.
ii unity-greeter 0.2.4-0ubuntu2 Unity Greeter
ii unity-lens-applications 5.6.0-0ubuntu1 Application lens for unity
ii unity-lens-files 5.6.0-0ubuntu1 File lens for unity
ii unity-lens-music 5.4.0-0ubuntu1 Music lens for unity
ii unity-lens-video 0.3.3-0ubuntu1 Unity Video lens
ii unity-scope-musicstores 5.4.0-0ubuntu1 Store music lens for unity
ii unity-scope-video-remote 0.3.3-0ubuntu1 Remote videos engine
ii unity-services 5.6.0-0ubuntu1 Services for the Unity interface

I installed unity and removed unity-2d, now the panels work correctly. After talking with didrocks, it looks like this bug is local whereas lots of people in the community haven't reported any problems with the same version of unity-2d. So, I'm setting the status of this bug to invalid.