First I had this problem, I couldn't get the login screen it brought me to tty so I installed other drivers and did apt-get -f install
And now I can get to Ubuntu but its very slow and games lag alot right at the menu.
The driver is nvidia-experimental-304.
Now I want to install an older driver that will work good.

Can anyone help? Thanks

Edit: When I try to install nvidia-current-updates it says this

admin@blackhat:~$ sudo apt-get install nvidia-current-updates

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:



The following packages have unmet dependencies:

 nvidia-current-updates : Depends: xorg-video-abi-11

                          Recommends: nvidia-settings-updates

E: Unable to correct problems, you have held broken packages.