Remove ugly white dots from the Ubuntu 13.04 login screen
Get rid of the nasty white dots from Ubuntu 13.04's login menu
Here's how you can get rid of the ugly white dots on the Ubuntu 13.04 login screen.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo xhost +SI:localuser:lightdm
sudo su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter draw-grid false
For more, see the original article at the link below.