BOOTING UBUNTU FOR THE FIRST TIME in Font

Generating Code-39 in Font BOOTING UBUNTU FOR THE FIRST TIME

CHAPTER 6 BOOTING UBUNTU FOR THE FIRST TIME
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root shell prompt). The typical usage for this prompt is to change the passwords of users if they forget their passwords, to free up disk space to run normally, and to uninstall buggy software to bring back system stability. The system commands that can be used for recovery are passwd (to change passwords), mv (to move files and folders), rm (to delete files and folders), cp (to copy files and folders), mkdir (to create a new folder), and dpkg (to install or remove software). These and other commands are discussed further in Appendix A. When you update your system software, you might find that new entries are added to the boot menu list. This is because the kernel has been updated. The kernel is the central system file that Ubuntu relies on, and essentially, the boot menu exists to let you choose between different kernels. Almost without exception, the first (topmost) entry is the one you ll want each time to boot Ubuntu, because this will always use the most recent version of the kernel, along with the latest versions of other system software. The other entries will start the system with older versions of the kernel and are provided in the unlikely situation that the latest kernel causes problems.
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Note All operating systems need a boot loader, even Windows. However, the Windows boot loader is hidden
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and simply starts the OS. Under Ubuntu, the boot loader usually has a menu so you can select Linux or perhaps an option that lets you access your PC for troubleshooting problems. When you gain some experience with Ubuntu, you might choose to install two or more versions of Linux on the same hard disk, and you ll be able to select among them by using the boot menu.
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Logging In
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After Ubuntu has booted (and much effort has been put into reducing the time Lucid Lynx takes to do it), you should see the login screen, as shown in Figure 6-2. Here you enter the username and the password you created during the installation process. If during installation you selected to be automatically logged in at startup, then you will not see this screen and will be presented with the desktop right away. Clicking the Shutdown Options button in the bottom-right corner of the screen brings up a menu from which you can opt to reboot the system or shut it down. Next to this button are the clock and the Universal Access Preferences button, which allows you to enable accessibility features such as the onscreen keyboard and the magnifier. The user account you created during installation is similar to what Windows refers to as an administrator account. This means that the within the account you use on a day-to-day basis you can also change important system settings and reconfigure the system. However, the main difference between Ubuntu and Windows is that you ll need to enter your password to make any serious changes, rather than clicking in a confirmation dialog box, as with Windows Vista or Windows 7 (of course, Windows XP doesn t have any kind of confirmation requirement at all!). Don t worry about damaging anything accidentally; trying to reconfigure the system or access a serious system setting will invariably bring up a password prompt. You can simply click the Cancel button if you don t want to continue.
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CHAPTER 6 BOOTING UBUNTU FOR THE FIRST TIME
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Note Unlike some versions of Linux, Ubuntu doesn t encourage the user to use an actual root (administrator)
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account. This is even disabled by default. Instead, it operates on the principle of certain ordinary users adopting superuser privileges that allow them to administer the system when they need to. Those are called sudoers. In UNIX terms, sudo is short for superuser do, meaning to perform a task as the superuser. A sudoer is a user account enabled to execute sudo for certain tasks, as defined in the sudoers file. The user account you create during setup has these privileges.
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