Hello

I have decidet to start from scratch with the installation of Kubuntu 18.04, as there are too much errors at present.
So, I reinstated the OS, this time with UNetBootin. All went well, at least so it seemed to me. Until I rebooted and, so I think a ttp (?) opened and asked for name and password. All was OK, just I did not found how to start the graphic dislpay. I would prefer to not to get this window in future, but to start directly with the graphic window.
Any help?