When we configure our account for login automatically, wheen booting we will be asked for our password for unlock the login keyring. If nobody else use your computer, this is useless, but it's really easy to remove:
First of all, we have to search for Passwords and Encryption Keys. Also you can open it from terminal:
You have to go to Passwords Tab, and there you will se a folder: Passwords: login
Right Click and then Change Password. Enter your old password, and leave blank the new password fields.