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Whenever an Ubuntu computer is restarted, you are required to provide your username and password in order to access your desktop. The first user account is created when Ubuntu is installed on the computer. Since Ubuntu is a multi-user system, a single computer can be used by many people. New user accounts can be created using the Users and Groups option found under -> .
Each person has their own desktop and can customize it to their own preferences without affecting the settings of other users.
During installation, the first user created by Ubuntu is a special user account. This account has special permission to perform operations restricted to other users, operations such as installing applications and adding user accounts to the system. For this reason, when running certain applications, such as the Ubuntu Update Manager, you will be prompted for your password. By entering your password, you make certain that no changes are made to your system without your permission.