VirtualBox 4.3.28 breaks Kubuntu

$ kstart5 plasma-desktop
kstart5: Omitting both --window and --windowclass arguments is not recommended
pci id for fd 10: 80ee:beef, driver (null)
libGL error: core dri or dri2 extension not found
libGL error: failed to load driver: vboxvideo
kf5.kiconthemes: "Theme tree: (Breeze Dark)"