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If a server gets its time from the Internet, it makes sense to use Internet time and use a very trustworthy time server If no Internet connection is available, use an internal clock and set the stratum accordingly (which means lower) If you re using your computer s internal clock, for example, it makes sense to use a low stratum level, such as 5..

If you ve read this book from 1, by this stage you no doubt have become comfortable with Ubuntu. You ve started to realize its advantages and are on the way to making it your OS of choice. But things might still not be quite right. For instance, you might find the color scheme is not to your taste. Or maybe your login picture is not entirely satisfactory. Maybe you simply want to get away from the default theme and stamp your own identity on the desktop. That s what this chapter is all about: personalizing Ubuntu so you re completely happy with your user experience. To do this, you will thoroughly examine the GNOME desktop and explore its potential. You ll also add some panache to that most important application, the web browser, so it fits perfectly into your desktop.

Ubuntu is similar to Windows in many ways, but the developers behind it introduced improvements and tweaks that many claim make the software easier to use. For example, Ubuntu offers multiple virtual desktops (also called workspaces) long considered a very useful user interface feature that hasn t found favor in Microsoft s designs.1

Just two elements are needed to make your own NTP time server: the configuration file and the daemon process. First, make sure that all required software is installed, running apt-get install ntp-server as root. The name of the daemon process is ntpd, and you can start it by using the /etc/init.d/ntpd startup script. After making all proper settings to its configuration file /etc/ntp.conf, you can start the daemon process manually by using /etc/init.d/ntpd start. The content of the NTP configuration file /etc/ntp.conf really doesn t have to be very complex. Basically, you just need three lines to create an NTP time server, as seen in Listing 9-12. Listing 9-12. Example ntp.conf Configuration server 127.127.1.0 fudge 127.127.1.0 stratum 10 server ntp.yourprovider.somewhere The first line in Listing 9-12 specifies what NTP should use if the connection with the NTP time server is lost for a longer period: this line makes sure that the local clock in your server will not drift too much by making a reference to a local clock. Every type of local clock has its own IP address from the range of loopback IP addresses. The format of this address is 127.127.<t>.<i>; the third byte refers to the type of local clock that is used and the fourth byte refers to the instance of the clock your server is connected to. The default address to use to refer to the local computer clock is 127.127.1.0. Notice that all clocks that can be used as an external reference clock connected locally to your server have their own IP address. The documentation of your clock tells you what address to use.

Note The virtual desktop feature also passed by Apple for a long time. However, it was included in OS X

Listing 2-21. Retrieving a List of Unique Membership Types SELECT DISTINCT m.MemberType FROM Member m

The Ubuntu desktop also moves the Programs menu (known in Ubuntu as the Applications menu) to the top of the screen, leaving the whole width of the screen at the bottom to display taskbar buttons. This is very sensible, because the buttons don t look cramped when more than a handful of applications are open. However, if you re not satisfied with Ubuntu s out-of-the-box look and feel, almost every aspect of the desktop experience is available for tweaking.

Even if your server is connected to an NTP server that s directly on the Internet, it makes sense to use Tip

1 The Desktops tool from Sysinternals can add similar but limited functionality to Windows; see http://technet.microsoft.com/en-us/sysinternals/cc817881.aspx.

You might be used to changing the desktop colors or wallpaper under Windows, but Ubuntu goes to extremes and lets you alter the look and feel of the entire desktop. Everything from the styling of the program windows to the desktop icons can be altered quickly and easily.