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There is an extremely simple way to install support for all of the common multimedia codecs that aren t distributed by default in Ubuntu. It s a package called Ubuntu Restricted Extras. With a single click, this package will bring in support for MP3 and the common proprietary video formats, including the Flash plug-in in Firefox, and as a bonus it will install the Microsoft TrueType core fonts (such as Times New Roman and Arial) and OpenJDK, a free/open source version of Java. (The proprietary Sun JDK/JRE is available as an alternative from the Canonical Partner Repository). To get this very convenient bundle of software onto your system, enter the Ubuntu Software Center, which you ll find in the Applications menu, and type restricted extras in the search bar. Select Ubuntu Restricted Extras from the results list, click the Install button, and enter your password when prompted.

A second way of using Ubuntu Server as a virtualization host is to configure Xen. In general, Ubuntu Server 7.10 has drastically improved support for Xen. In this section, you ll read how to set up Ubuntu Server as a host for Xen virtualization. You ll also read how to install Windows and another instance of Ubuntu Server as guests in a Xen environment. Before starting the hands-on part of this section, you should know a bit about Xen terminology. In Xen, there s no difference between a host and a guest operating system. This is because the words host and guest suggest a hierarchical relation that doesn t exist. Instead, Xen talks about the domain 0 operating system and the other operating systems. These other operating systems are referred to as domain U machines. The domain 0 (or just dom0) is the first operating system that loads on a physical machine, and it has some specific responsibilities in the Xen environment, including driver management. In other environments, the dom0 machine would be referred to as the host operating system. The domain U (or just domU) machines are virtualized machines that do not have a special responsibility with regard to virtualization. In other virtualized environments, these machines would be referred to as guest operating systems.

Figure 16-1. Installing the Ubuntu Restricted Extras package in the Ubuntu Software Centre is the easiest way to get support for the most commonly used digital audio and video formats.

Having tried some of the steps in the previous chapter, you will have simplified your query to isolate where the problem is. In this section, we will look at some specific symptoms and some likely causes.

You need to install a few packages to configure Ubuntu Server as a Xen host All of these are installed automatically when using the ubuntu-xen-server package, so to start using Xen, simply issue the following command: apt-get install ubuntu-xen-server Because Xen uses a special kernel that s loaded before the normal Linux kernel, you have to check the /boot/grub/menulst file to make sure that the Grub boot configuration is changed to boot the Xen kernel as its default To make sure that you re running a Xen kernel, use the uname r command Its result gives a kernel name like 2622-12-xen, indicating that you re using a Xen kernel Now reboot your server to load this specific Xen kernel After booting this kernel, the normal Linux kernel is booted and, following that, your Ubuntu Server installation loads.

Once the Ubuntu Restricted Extras is installed, all of Ubuntu s playback software will automatically support MP3 files, including Totem, Rhythmbox, and any other playback software you install that is designed for the GNOME Desktop. This is made possible because, behind the scenes, all of Ubuntu s audio and video playback is underpinned by the GStreamer multimedia framework. Once the codec-supporting plug-ins have been installed into GStreamer, as a user you won t come into direct contact with GStreamer, but the benefit of having this integrated system in the background is that you install plug-ins only once for the entire system.

Even if you don t get around to installing Ubuntu Restricted Extras, Ubuntu s multimedia applications will automatically suggest which codecs to download and install when you attempt to play a multimedia file that s in a restricted format, such as MP3 Here we walk through what happens when you try to play an MP3 on an Ubuntu system that hasn t yet had the required codec installed The same procedure will apply when you try to play back any unsupported audio or video file format; all that will differ is the choice of codecs offered to you 1 2 3 Copy an MP3 file to your computer Double-click the MP3 file.