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CHAPTER 22 OPTIMIZING YOUR SYSTEM
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Note When you ve finished, save the file and quit Gedit.
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Under Windows, you might be used to controlling which programs start up at the same time as the Desktop, by adding or deleting entries in the Start menu s Startup program group. When running Ubuntu, you can control which system applets are started automatically, as well as your personal choice of Desktop applications. To control which programs start up with the GNOME Desktop, use the Startup Applications Preferences dialog box (gnome-session-properties). To run the program, click System Preferences Startup Applications. Clicking the Startup Programs tab shows the programs that start when GNOME does. You can disable a startup program in the list by unchecking the check box beside it. You definitely should have a thorough look at the applications that are started by default, as it is quite likely that you ll find some that are of no use to you at all. You should see most or all of the following entries, though our test system had some additional elements added by other applications and services. Bluetooth Manager: This program is responsible for the Bluetooth applet that can be used to send and receive files, browse other Bluetooth devices, set up Bluetooth services, and manage Bluetooth service settings. You can disable this applet if your system is not Bluetooth-enabled or if you just don t want to use Bluetooth at all. Certificate and Key Storage: When using secured tools on a local network or the Internet, you ll often receive a certificate that is used to prove the identity of the remote host. You ll receive encryption keys as well. This applet allows you to store all those items in a secure place. So you had better leave it on. Check for New Hardware Drivers: This tool scans your hardware devices and checks whether new third-party proprietary drivers can be used with them. If a new driver is compatible, this tool provides a facility to download, install, and configure the driver in your computer. If your hardware devices are working perfectly without third-party drivers, or you re uncomfortable using proprietary software, it is safe to disable this program. Otherwise, keep the tool enabled so you can receive driver bug fixes and updates. Disk Notifications: Your hard disk by default is monitored by the SMART utility. If the current disk state is degrading, SMART will tell you about it. So it makes sense to leave the Disk Notifications option on to make sure that you are updated as soon as something goes wrong on your hard drive. And if you want to switch this option off, use System Administration Disk Utility on a regular basis to monitor the current state of your hard disks. Evolution Alarm Notifier: As its name suggests, this utility ties into Evolution s calendar function in order to notify you of events, such as an appointment that you don t want to forget. If you don t use Evolution or don t use its calendar function, this applet can be disabled. GNOME Login Sound: As you might have guessed, this plays the Ubuntu welcome music that you hear whenever the GNOME Desktop appears. It can be disabled without causing any problems. Network Manager: This applet manages your wi-fi, Ethernet, and VPN connections. This is useful for laptop users who connect to several wi-fi networks on the go, as discussed in 8. You should not disable this program.
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CHAPTER 22 OPTIMIZING YOUR SYSTEM
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NVidia X Server Setting: This program helps you to configure settings for an Nvidia graphics card. As you would have guessed, this program can only be used for Nvidia graphics cards. If you leave it on, you can use this program to change graphics display settings in a convenient way. This is in particular useful if you have to change graphics display settings often for example, if you regularly use your computer with an external projector. Personal File Sharing: This application allows users to enable file sharing with other users. This is a convenient program that makes it easy to work together with other users, but at the same time it s also a potential security risk. For that reason, you might want to switch this program off unless you really need it. Power Manager: This program controls all aspects of GNOME s power management, including the useful hibernate feature that can save the contents of the system s RAM to provide quicker startup. If your computer is a notebook, this tool should be considered essential. If you have a desktop PC and are looking to save power by using hibernate, suspend, or screen blanking after a period of inactivity, you won t want to disable Power Manager. Disabling it will remove the Suspend and Hibernate options from the System Quit dialog box. So better not switch it off. Print Queue Applet: This applet provides an interface for you to cancel or repeat printer jobs. It is also responsible for automatically setting up a printer for use when you plug in a printer. You can disable this applet if you will never print from your computer. Remote Desktop: This background service allows other computers to connect to your computer, after an invitation has been issued (see 33). If you have no intention of remotely accessing your computer, this service can be disabled. Secret Storage Service: This is a background component necessary for the application that generates and stores encryption keys. If you do not encrypt files and/or e-mails, this service can be disabled. Ubuntu One: This item gives access to Ubuntu One, the Ubuntu cloud solution offered by Canonical. Switch it on if you intend to use this service. Update Notifier: This is the Update Manager tool. You shouldn t disable this applet, because it performs the essential task of checking whether any system updates are available. It runs in the background after it is started and hardly impacts startup time at all. However, if you absolutely must prune valuable milliseconds from startup, you can disable it. You can then check for updates manually, whenever you desire, by clicking System Administration Update Manager. User Folders Update: This tool pops up during the start of your session if you have recently changed the default language (System Administration Language Support) of your computer. The tool gives you an option to translate the folder names Desktop, Templates, Public, Documents, Music, Pictures, and Videos in your /home directory to the new default language. You can disable this tool if you don t change your language settings. Visual Assistance: This utility runs assistive technologies such as the Orca screen reader, magnifier, and Braille application if these tools were enabled in the Assistive Technologies Preferences window (System Preferences Assistive Technologies). If you are not using assistive technologies, you can disable this applet. The Options tab contains a single item labeled Automatically Remember Running Applications When Logging Out, and this is designed to get you back exactly where you started next time you launch the computer. The system has been problematic in previous versions of Ubuntu, but the developers appear to have sorted things out. The exception is Wine-based Windows applications. These didn t seem to automatically start on our test system, but everything else, including KDE applications, worked fine.
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