Just managed to find that the culprit is actually the clutter plugin (gstreamer1.0-clutter-3.0), uninstalling that (sudo dpkg -r --force-depends gstreamer1.0-clutter-3.0) makes the session start again.
Just managed to find that the culprit is actually the clutter plugin (gstreamer1. 0-clutter- 3.0), uninstalling that (sudo dpkg -r --force-depends gstreamer1. 0-clutter- 3.0) makes the session start again.