When I log in my Ubuntu 13.04 account, my login screen still shows up as my desktop background, making my computer slow. Recently, I made some changes when I log in, such as removing both "Guest Login" and "Remote Login." I used the following code:

sudo gedit /etc/lightdm/lightdm.conf

And changed my default login information:

user-session=ubuntu

greeter-session=unity-greeter

To this:

user-session=ubuntu



greeter-session=unity-greeter



allow-guest=false



greeter-show-remote-login=false

I feel like this was the source of the problem so I tried to delete the added lines but the file was "read only." Is there anyway I can edit the file to fix my problem?

Also, is there anything else I can do so my desktop can return back to normal without the login screen showing? I just recently downloaded Ubuntu 13.04 a couple of days ago so I'm only a beginner.