You can start X sessions in a variety of ways. The Ubuntu installer sets up the system initialization table /etc/inittab to have Linux boot directly to an X session using a display manager (that is, an X client that provides a graphical login). After you log in, you use a local session (running on your computer) or, if the system is properly configured, an X session running on a remote computer on the network. Logging in via a display manager requires you to enter a username and password. You can also start X sessions from the command line. The following sections describe these two methods.
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