So I am going to try and remove :
ok.. rebooted and got absolute blackspace. To recover I had to go to terminal and reinstall the lightdm-kde-greeter.
lightdm-kde-greeter (0.3.2.1-1ubuntu2) ..
So.. in summation... although Unity 3D and Ubuntu in general is still operative, the original lightdm ubuntu greeter has been wiped, replaced, supplanted or overwritten and this in a sense is a mild form of breakage that will take a lot of cli codeing to fix& clean or even require a fresh install.