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By default, every Linux system installation creates a user with the name root. Many Linux distributions ask you to enter a password for this user during the installation. Ubuntu Server doesn t, and it instead takes a radically different approach to performing privileged tasks. Ubuntu Server takes a different approach for several good reasons. The powers of the user root are limitless within the confines of that operating system. As root, you can bypass all system security and do anything at all. And you will not be given a warning screen if, for instance, you log in as root and then mistakenly type in a command that destroys all the files. This is why Ubuntu Server handles privileged access in a different way. By default, the user root does not have a password, so you cannot log in and work as root in the conventional way, but you still need to perform many tasks that require root privileges. For this purpose, Ubuntu offers the sudo mechanism, which is explained in detail in 5. With sudo, normal users can perform tasks that require root privileges. And it s very simple: for every command that needs root permissions, you type sudo first. For example, whereas user root could just type passwd linda to change the password of user linda, a normal user enters sudo passwd linda.

Note In days of old, special tools were used to access MS-DOS floppies under Linux, and you might hear

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some Linux old-hands talking about them. Nowadays, you can simply use Nautilus without needing to take any special steps.

Note Want to work as root Use the command sudo su, and you ll be root. Alternatively, you can change the password of user root as well, which allows you to log in as user root directly. Don t want the possibility to log in as root ever In that case, you should change the default shell for this user to /bin/false. In 5, you ll read how to do that.

Whenever you double-click any entry in the Computer window, it opens a Nautilus file browser window. You can copy files by clicking and dragging, and right-clicking files offers virtually all the options you could need.

Computer each time to access your floppy, CD, or DVD drive. These drives are mounted in the /media folder on your hard disk. Just browse to /media/floppy and /media/cdrom.

In a default installation, any user can use sudo to perform tasks as root. As you can guess, this doesn t make for a very secure situation. So one of the first things that you should do is limit this privilege. In 5, you can read how to do that.

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Ubuntu isn t quite like Windows when it comes to ejecting or unplugging removable storage devices. In practically all cases, devices must be unmounted, which is to say that you need to tell Ubuntu that you re finished with the device in question and that you re about to unplug it. In the case of CD or DVD discs, you can simply press the Eject button on the drive itself. Ubuntu is able to detect that the disc is being ejected and automatically unmounts the drive. If the disc ever refuses to eject, right-click its icon on the desktop or within Computer and select Eject. In the case of floppy disks, USB memory sticks, and other USB storage devices, you should always right-click the icon and select Unmount Volume. When unmounting, you may need to wait a short while for any file operations to complete on the drive. If this is the case, you ll receive a notification in the system tray. Then you can unplug or remove the device. This also applies when you re removing a memory card from a card reader before pulling out the card from the reader, it needs to be unmounted.

Note It s necessary to close any files that were open on the device before unmounting, and even close any file

You don't like sudo and want to work as root anyway You can do that, but you need to first set a Tip