first of all thank you for your effort, its really amazing what u did.

The thing is I followed on step by step on disabling the nVidia, but now when I load kubuntu i get the main screen loading then after a while before the login page shows up, the screen turns black and there is nothing i can do, I logged to fail safe, tried to revert the settings by deleting all the files i created and re-editing the files, but nothing... i still get this black screen.

How can I revert or fix this?? can you please help?