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2.

In Xubuntu, for security reasons, administrative tasks are confined to users with special privileges. Administrative access is given to individual users, who may use the <application>sudo</application> command to perform administrative tasks. The first user account you created on your system during installation will, by default, have access to sudo. You can restrict and enable sudo access to users with the <application>Users and Groups</application> application (see <ulink url="users-groups;">users and groups</ulink> for more information).

5.

Sudo will remember your password for a set amount of time, which by default is 15 minutes, but can be changed. This feature was designed to allow users to perform multiple administrative tasks without being asked for a password each time.