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At first glance, it may appear that there are very few Linux antivirus programs. Actually, many of these exist, but they re designed to work on server computers and primarily guard against Windows viruses, in addition to the handful of Linux viruses. The idea is that they protect Windows users who access the server. Very few antivirus products are aimed at the Linux desktop. However, one example includes F-Secure s Anti-Virus for Linux Workstations. This costs around 80 euros (just under $100) and is available from www.f-secure.com/estore/fsavlinuxwks.shtml. AVG (www.grisoft.com) and Kaspersky (www.kaspersky.com) also produce Linux workstation versions of their antivirus products. The main issue with all of these programs is that they re not open source, as with most of the Linux software included in Ubuntu. If you absolutely must have your entire system running free software, consider ClamAV (www.clamav.net). This is a product designed to work on Linux servers but is flexible enough to run on desktop computers, too. ClamAV is included in the Ubuntu software repository, and so is available via the Synaptic Package Manager program. Be aware that ClamAV is a command-line program, however. You ll need to read its man page to learn how it works. In addition, you might choose to read the online documentation at www.clamav.net/doc.
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CHAPTER 9 HOW TO SECURE YOUR COMPUTER
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The Ubuntu notification area (the equivalent of the Windows system tray) contains a program that automatically monitors the package repositories and tells you when updates are available. This is an extension of the Synaptic Package Manager program called Update Manager. If you ve already configured the Synaptic Package Manager, as described in 8, and haven t yet updated your system, this icon will have probably turned into a red circle with two arrows in it. This is informing you that updates are available. In addition, each time you boot, you will see a speech bubble telling you that updates are available. When your system is completely up-todate, the icon will disappear. Clicking the Update Manager icon opens the Software Updates window, as shown in Figure 9-3. To go online and grab the updated files, click the Install button at the bottom-right side of the window. You will probably be asked to enter your root password, because system files will need to be altered.
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Figure 9-3. You ll be informed if your system is in need of updates, and the Update Manager can take care of everything for you. Be aware that some updates can be large and might take some time to download, particularly if you re doing it for the first time after installing Ubuntu. (On my system, I had to download almost 200MB of files on my first update.)
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CHAPTER 9 HOW TO SECURE YOUR COMPUTER
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Once the downloads have finished, you probably won t need to reboot unless the kernel file has been updated. The Software Update program will inform you if you need to restart the computer.
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A firewall is a set of programs that protects your PC when it s online. It does this by watching what data attempts to enter your PC from the Internet and allowing in only what it is sure is secure (which usually is what you ve asked for). It also attempts to close off various aspects of your Internet connection, so that crackers don t have a way in should they target your system. Although Ubuntu includes a powerful firewall in the form of iptables, you ll also need a program that can manage it. Here, I ll show you how to use Firestarter, available from the Ubuntu software repository, for this purpose. Together with the built-in firewall, this really does provide industrial-level protection. The benefit of configuring the firewall is that even if your system has security vulnerabilities because of buggy software, crackers will find it a lot harder to exploit them across the Internet. When someone attempts to probe your system, it will appear to be virtually invisible.
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Caution Although software firewalls such as the one built into Linux offer a high level of protection, it s best to use them in concert with a hardware firewall, such as that provided by most DSL/cable broadband routers (curiously, some of these routers actually use Linux s iptables software as well). Many security experts agree that relying solely on a software firewall to protect a PC affords less than the best level of protection.
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