10.4 Summary
As a multi-user operating system, Ubuntu has been designed to support controlled access for multiple users. During installation, a single user account was created. Additional user accounts may be added to the system using a set of command-line tools, via the Cockpit web interface or using the GNOME settings app. In addition to user accounts, Linux also implements the concept of groups. New groups can be added and users assigned to those groups using command-line tools and each user must belong to at least one group. By default a standard, non-root user does not have permission to perform privileged tasks. Users that are members of the special sudo group, however, may perform privileged tasks by making use of the sudo command.
