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.You should notbegin the installation procedure until you have backed up all data onyour system and determined that your backup is error-free.3.1.1 The Installation Program User InterfaceLike other modern Linux distributions, Debian GNU/Linux includes a screen-basedinstall program that simplifies the installation and initial configuration of Linux.However, the install program works somewhat differently than a typical MicrosoftWindows application.For instance, it does not support use of a mouse or otherpointing device; all input is via the keyboard.So that you can make effective use ofthe install program, the next three subsections describe the user-interface controlsused by the install program, present the special keystrokes recognized by the installprogram, and explain the use of Linux's virtual consoles.3.1.1.1 User-interface controlsFigure 3.1 shows a typical screen displayed by the install program.This screenincludes the following controls:A main window The install program runs in a full screen window.The top line of the windowdisplays the name of the current installation step.In Figure 3.1, the current step is"Select CD Interface Type." You cannot minimize or change the size of the installprogram's main window.The cursorLike Windows programs, the installation program has a cursor on screen.UnlikeWindows, the cursor movement and cursor actions are controlled by the keyboard,rather than by the mouse.The location of the cursor is called the input focus.Atany time, exactly one control has the input focus, which lets it respond to keyboardinput.The install program displays a rectangular blue cursor that identifies the fieldhaving the input focus.In Figure 3.1, the list item named /dev/hdc has the inputfocus.A scrollable listScrollable lists let you page through a list of items that may be too long to displayall at once.At any time, one line in the scrollable list is active, as indicated by bluehighlighting.When a scrollable list has the input focus the Up and Down arrowkeys let you choose a different active item.Some scrollable lists associate actionswith items; you can initiate the action associated with the active item by pressingEnter.ButtonsMany install program windows include one or more buttons.You can make abutton active by pressing the Tab key to move the cursor to the button.When abutton is active, pressing Enter initiates the action associated with it.Figure 3.1: A typical screen displayed by the install programAlthough Figure 3.1 does not show a text box, some install program windowsinclude one.Text boxes let you type text that is sent to the install program whenyou press the Ok button.You can recognize a text box by the underscores thatdefine its input area.3.1.1.2 Common keystrokesSeveral keystrokes let you direct the operation of the install program.For example,you can use the Tab key to move the input focus from one control to the next.Table 3.1 summarizes the keystrokes that the install program recognizes.You maywant to keep this table handy as you work with the install program. Table 3.1: Keystrokes Recognized by the Install ProgramKeystroke MeaningEnter Send a button press to the install program.Tab Move the input focus to the next field.Down Move the cursor down.Up Move the cursor up.Left Move the cursor left.Right Move the cursor right.WARNING: You should press keys only when an installationprogram dialog box is active.Pressing keys at other times can sendkeystrokes to programs invoked by the install program, which mayinterpret your input in an unpredictable fashion.3.1.1.3 Using virtual consolesA console is a combination of a keyboard and a display device, such as a videomonitor.A console provides a basic user interface adequate to communicate with acomputer: you can type characters on the keyboard and view text on the displaydevice.Although a home computer system seldom has more than one console, Linuxsystems provide several virtual consoles.By pressing a special combination of keys,you can control which console your system's keyboard and monitor are connectedto.Table 3.2 describes the virtual consoles used by the install program.The maininstallation dialog appears in virtual console 1.The contents of other virtualconsoles can be useful in troubleshooting; however, you will not usually need toswitch from one virtual console to another.Nevertheless, you may find itinteresting to view the contents of the virtual consoles.Table 3.2: Virtual Consoles Used by the Install ProgramConsol Keystrok Contentse e1 ALT-F1 The installation dialog.2 ALT-F2 A shell prompt, which lets you enter commands to beprocessed by Linux.3 ALT-F3 The installation status log, containing termination messages oflaunched programs.4 ALT-F4 The installation log, containing messages from the installprogram
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