Kubuntu provides a graphical user interface to add new users to the system. The User Manager module from KDE offers it so that the method will be the same across other Linux systems running KDE.
Steps to add new user in Kubuntu (KDE):
Open
System Settings in the
Computer of the
K start menu.
You can also user the search bar and search for settings to bring up the same icon.
Go to
Account Details from
Personalization section.

Click on
User Manager on the left navigation tab.

Click on
New User.

Fill in details such as the
username and
Real Name.
A window will popup upon clicking the
Password field. Enter a complex-enough password till
This password is good text appears and click
OK.

Tick on the
Administrator checkbox if you want to allow
sudo or administrator access for the user and on the
Automatic Login checkbox if you want the system to automatically login to this user upon boot-up. Click
Apply.

Enter your password to authenticate to the system.
This requires your user to have administrator privilege in the system.
Your new user creation is now complete and can now be seen in the user list.

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