X server and nvidia

• To stop the X session
• Hit CTRL+ALT+F1 and login using your credentials.
• kill your current X server session by typing 
• sudo service lightdm stop or sudo stop lightdm
•  If you want to reinstall the nvidia exe
• Enter runlevel 3 by typing 
• sudo init 3 and install your *.run file.
•  You might be required to reboot when the installation finishes. If not, run
• "sudo service lightdm start"  or "sudo start lightdm" to start your X server again.
• If you haven't stop the X server at all, you can come back to the X server environment from the command line environment by doing:
• Hit CTRL+ALT+F7 and login using your credentials.