i got a similar problem with the VirtualBox Service error. Logging in to Mate works, but logging in to Unity ends up with the mentioned error:
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/etc/gdm/Xsession: Beginning session setup... ... Failed to connect to the VirtualBox kernel service Failed to connect to the VirtualBox kernel service Failed to connect to the VirtualBox kernel service Failed to connect to the VirtualBox kernel service
I added Unity to the session menu according to this guide: http://ubuntuportal.com/2012/09/how-to- ... -maya.html
This is the same login-script I could find on an Ubuntu machine. To fix the problem I already made an update, reinstalled Unity and even reinstalled the OS, all this with no result.
Prior to this installation I installed Unity on 3 other machines (all with Mint Maya) and there had been no problems at all.
Also I do not understand what the VirtualBox kernel has to do with this - there is no virtual machine running, nor did I install virtualbox by now. However some virtualbox packages seemed to be installed.
Does anyone know whats causing the problem and could explain my why a virtual kernel service is required or is there an other problem?
Inside the Mate environment Unity can be run without problems...
Thanks in advance