During the installation ubuntu ask for user and pass, after the installation you must login with the user and pass that you provided during install.
Is that what are you asking?
If you dont wanna to put user and pass in the login screen always, then you must configure automatic entrance to the system with your user.
System->Administration->GDM Login, or Login Window or so (not sure about the name because im using spanish distro and its called Ventana de Entrada)
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