You normally authenticate via username and password combination to access your Linux system. Whether it's a necessity or simply for convenience, you can configure your KDE-based Linux system to log you in during system boot automatically. It could be the case if you're running a dedicated or single-user system.
This is possible if you're using SDDM as your login manager. SDDM is the default login manager in Kubuntu or most other KDE-based Linux distributions.
Make sure this check box is not ticked to disable automatic login.
Your user need to have administrator privilege.
Comment anonymously. Login not required.