Ubuntu was working with default mesa graphic drivers. I tried to install nvidia driver for my geforce gt650m. I installed different versions of nvidia 319, 310, etc. All of them installed but my entire UI system crashed. Now my login screen looks so small, i don't have desktop or unity.
I am running 13.04.
My story about the Nvidia drivers: At first
apt-get install nvidia-current, removed it later.
Then i just downloaded nvidia 319 310 313 different versions with wget stopped gdm and just run