I just installed ubuntu from scratch.However plain installation does not include nvidia driver initself so I installed it from 'additional drivers' tool but it crash the ubuntu and take the resolution and Unity down. I looked at all the posts on Internet and come up no working solution. I install nvidia-current than remove , install nvidia-current-update than remove. I tried all the possibilities that are proposed on internet. Only working solution was removing all the nvidia related packages with apt-get remove nvidia* then installing nouveau by apt-get install xserver-xorg-video-nouveau. It takes all the things as usual but I guess without correct nvidia driver. Am I installing wrong driver or what? Wha might be the problem?

My graphical card is Geforce GT635M on Ubuntu 12.10