djx@ubuntu:~$ apt-cache search kde

Depending on which repositories you have enabled, that tool returns about a thousand packages. Many of those results will not even have KDE in the package name, but will be matched because the description contains the word KDE.
You can filter through this information in several ways. First, you can instruct apt-cache to search only in the package names, not in their descriptions. This is done with the –n parameter, like this:

djx@ubuntu:~$ apt-cache –n search kde

Now the search has gone down from more than 1,000 packages to a few hundred. Another way to limit search results is to use some basic regular expressions, such as ^, meaning “start,” and $, meaning “end.” For example, you might want to search for programs that are part of the main KDE suite and not libraries (usually named something like libkde), additional bits (such as xmms-kde), and things that are actually nothing to do with KDE yet still match our search (like tkdesk). This can be done by searching for pack-ages that have a name starting with kde, as follows:

djx@ubuntu:~$ apt-cache –n search ^kde

Perhaps the easiest way to find packages is to combine apt-cache with grep, to search within search results. For example, if you want to find all games-related packages for KDE, you could run this search:

djx@ubuntu:~$ apt-cache search games | grep kde

When you’ve found the package you want to install, run it through apt-get install as per usual. If you first want a little more information about that package, you can use apt-cache show pkg, like this:

djx@ubuntu:~$ apt-cache showpkg mysql-server-5.0

This shows information on “reverse depends” (which packages require, recommend, or suggest mysql-server-5.0), “dependencies” (which packages are required, recommended, or suggested to install mysql-server-5.0), and “provides” (which functions this package gives you). The “provides” list is quite powerful because it allows different packages to provide a given resource. For example, a MySQL database-based program requires MySQL to be
installed, but isn’t fussy whether you install MySQL 4.1 or MySQL 5.0. In this situation, the Debian packages for MySQL 4.1 and MySQL 5.0 will both have “mysql-server-4.1” in the provides list, meaning that they offer the functionality provided by MySQL 4.1.
Therefore, you can install either version to satisfy the MySQL-based application.

At first glance, Synaptic looks a little like the Add/Remove Applications window. Along the left are software categories (although this time, there are more of them), along the top right are the package selections for that category, and on the bottom right is the Package Information window that shows information about the currently selected package. To install or remove software, click the check box to the left of its name, and you’ll see a
menu that offers the following options:

• Unmark—If you have marked this package for installation, upgrade, or one of the other options, this removes that mark.
• Mark for Installation—Add this package to the list that will be installed.
• Mark for Re-installation—If you have some software already installed, but for some reason it’s not working, this reinstalls it from scratch.
• Mark for Upgrade—If the software has updates available, this will download and install them.
• Mark for Removal—This deletes the selected package from your system, but leaves its configuration files intact, so that if you ever reinstall it, you do not have to reconfigure it.
• Mark for Complete Removal—This deletes the selected package from your system, but also removes any configuration files, purging everything from the system.

After you have made your changes, click the Apply button to have Synaptic download, install, upgrade, and uninstall as necessary. If you close the program without clicking Apply, your changes will be lost.

Beneath the categories on the left side of the screen, you will see four buttons: Sections, Status, Search, and Custom, with Sections selected. These customize the left list: Sections is the Categories view, Status lets you view packages that are installed or upgradable, Search stores results of your searches, and Custom has some esoteric groupings that are useful only to advanced users.
You can press Ctrl+F at any time to search for a particular package. By default, it is set to search by package name. You may change the Look In box setting to Description and Name. As mentioned already, your search terms are saved under the Search view (the button on the bottom left), and you can click from that list to re-search on that term.
As well as providing the method of installing and removing software, Synaptic provides the means to configure the servers you want to use for finding packages. In fact, this is where you can make one of the most important changes to your Ubuntu system: You can open it up to the Ubuntu Universe and Multiverse.
Ubuntu is based on the Debian distribution, which has more than 15,000 software pack-ages available for installation. Ubuntu uses only a small subset of that number, but makes it easy for you to enable the others. When you use Synaptic, you see small orange Ubuntu logos next to every package; this identifies them as being officially supported by the Canonical supported Ubuntu developers. The other packages do not have this logo, but they are still supported by the wider Ubuntu community of developers.
To enable the Universe and Multiverse repositories, go to Settings, Repositories. This list shows all the servers you have configured for software installation and updates, and includes the Universe and Multiverse repositories. When you find them, check them, and then click Close.

Synaptic shows a message box warning you that the repository listings have changed and that you need to click the Reload button (near the top left of the Synaptic window) to have it refresh the package lists. Go ahead and do that, and you should see a lot more software appear for your selection. However, notice that only a small number have the official Ubuntu “seal” attached, which means you need to be a bit more careful when installing software.

CLICK HERE to install Synaptic Package Manager from Ubuntu Software Center.

Or

Open a terminal (Dash > Terminal) and enter

sudo apt-get install synaptic

The default sudo configuration in Ubuntu is pretty basic and can be found in the /etc/sudoers file.
Note that you must never edit this file using a standard text editor. You must use the visudo tool.
visudo is required because it will perform extra validation on the sudoers file before you close it to make sure there aren’t any syntax errors. This is crucial because a syntax error in a sudoers file could lock out all of the users on your system. Here are the roles defined in the default Ubuntu /etc/sudoersfile:

# User privilege specification
root ALL=(ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

The first rule allows root to use sudo to become any other user on the system, and the second rule allows anyone who is a member of the admin group to run any command as root. So when you want to run a command as root on a default Ubuntu system, type sudo followed by the command to run.
For instance if you wanted to run apt-get  update as root, you would type:

$ sudo apt-get update

Knowing these directories can help you find files when you need them. This knowledge can even help you partition hard drives when you install new systems by letting you choose to put certain directories on their own distinct partition, which can be useful for things like isolating directories from one another, such as a server security case like putting a directory like /boot that doesn’t change often on its own partition and making it read-only and unchangeable without specific operations being done by a super user during a maintenance cycle. Desktop users probably won’t need to think about that, but the directory tree is still quite useful to know when you want to find the configuration file for a specific program and set some program options system wide to affect all users.

Key Features of Warsow

• Open source engine – freedom to make complete gameplay mods.
• Easy scripting engine with Javascript/C++-like style syntax for making your own gametypes! (AngelScript)
• Freedom to run your own servers (ranked servers will need server key, which we provide for free upon request!)
• Flexible HUD scripting engine for customizing your HUD.
• Powerful “e-sports”- features like Warsow TV with OGG audio stream support for providing improved streaming capabilities.
• Highly customizable graphic settings.
• Global stats and match result saving for following your matches.
• Rich User Interface based on XHTML/CSS standards for layout and presentation and powerful scripting engine with Javascript/C++-like syntax.

LibreOffice contains a number of productivity applications for use in creating text documents, preparing spreadsheets, organizing presentations, managing projects, and so on.

The following components of the LibreOffice package are included with Ubuntu:

. Writer—This word processing program enables you to compose, format, and organize text documents. If you are accustomed to using Microsoft Word, the functionality of LibreOffice Writer will be familiar to you.
. Calc—This spreadsheet program enables you to manipulate numbers in a spread-sheet format. Support for all but the most esoteric Microsoft Excel functions means
that trading spreadsheets with Excel users should be successful. Calc offers some
limited compatibility with Excel macros, but those macros generally have to be
rewritten.
. Impress—This presentation program is similar to Microsoft PowerPoint and enables
you to create slideshow presentations that include graphs, diagrams, and other
graphics. Impress also works well with most PowerPoint files.

The following five applications are not included by default with Ubuntu, but are quite useful. All but Dia are a part of the LibreOffice project and add features to the suite that are not used as often as those Ubuntu installs by default. You must install them from the Ubuntu repositories if you want or require their functionality.

. Math—This math formula editor enables you to write mathematical formulas with a number of math fonts and symbols for inclusion in a word processing document. Such symbols are highly specialized and not easily included in the basic functionality of a word processor. This is of interest primarily to math and science writers, but Math can be useful to anyone who needs to include a complex formula in text.

. Base—This is a fully functional database application.
. Draw—This graphics application allows you to create images for inclusion in the documents produced with LibreOffice. It saves files only in LibreOffice format, but it can import most common image formats.
. Dia—This technical drawing editor from the GNOME Office suite enables you to create measured drawings, such as those used by architects and engineers. Its functionality is similar to that of Microsoft Visio.
. Planner—You can use this project management application for project planning, scheduling, and tracking; this application is similar to, but not compatible with, Microsoft Project. Once installed, you will find it under the name project Management.

LibreOffice is Preinstalled on Ubuntu 12.04 , Starting with Ubuntu 11.04, LibreOffice is part of Ubuntu. Since LibreOffice is already part of the standard packages, just search for “libreoffice” in your favorite package manager. To find out which LibreOffice version ships with a specific Ubuntu version

To install Liferea-RSS on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

sudo apt-get install liferea

With Evolution, you can handle all your email and contacts, as well as make appointments and track tasks.

You need to have the following information to successfully configure Evolution (or any email client):
. Your email address
. Your incoming email server name and type (that is, pop.email.com, POP, and IMAP)
. Your username and password for the incoming mail server
. Your outgoing mail server name (that is, smtp.email.com)
As many people are moving to web-based mail options like Google’s Gmail or Yahoo! Mail, email programs have started to decline in popularity. One thing that sets Evolution apart is that you can still use it for the other features and disable the email portion of the program by selecting “none” as your mail transfer agent instead of POP, IMAP, and so on.
In addition, Evolution can interact with an existing web calendar program if it uses one of the common formats, such as CalDAV. This allows you to use your calendar remotely as you are used to, but also permits the Ubuntu desktop to have access to your events and embed them into your desktop panel (which it does by default using Evolution).

it’s quite easy to install on Ubuntu 12.04 Precise Pangolin. Simply open up a Terminal window, and use this command:

sudo apt-get install evolution

(If you don’t know how to find a Terminal window, click on the “Dash”, the Ubuntu icon on the upper-right hand corner of your screen, and search for Terminal.)

Apt-get will ask for your password, and then download and install Evolution . Once it’s done, you can launch Evolution by going to the Dash, searching for “Evolution”, and double-clicking on the Evolution icon.

• Use the Special key (that is, the Windows key) to open the Dash. Click Esc to close the Dash without selecting anything in it.
• Use the middle mouse button to click on an icon in the Launcher to open more than one instance of the same program. On a laptop, you can do this by clicking both right and left buttons simultaneously.
• Holding Alt+Tab brings up a menu of icons showing open programs so that you may switch between them quickly. Hold Alt and press Tab repeatedly to move from one program to the next until you reach the one you desire. Shift+Alt+Tab scrolls through them in reverse order. This and the next shortcut work together as a power-ful combination when the application you want has multiple windows or instances.
• Switching from Alt+Tab to Alt+` (on an English keyboard; for other keyboards, read on) modifies the Alt+Tab menu so that it shows miniature images of open program windows when there are multiple instances of the same program. Hold Alt and press ` repeatedly to scroll through and select a specific instance. If you begin this while the desktop focus is on an instance of a program that has multiple instances open, you automatically begin with this set of open instances to select from among them. (On an English keyboard, ` is the key just above the Tab key. For other language keyboards, it is the whatever key in this same location, regardless of the character represented on the key itself.)
• Icons in the Launcher indicate when multiple instances of a program are open or when a program has multiple windows. Click twice on an icon in the Launcher that shows multiple arrows next to it, and all of its windows will be displayed for you to select the one you desire.
• Click PrtSc (Print Screen) to take a screenshot of the current workspace.
• Use Special + T to open the trash can.
• Click Ctrl+Alt+arrow-key to move up, down, right, and left from workspace to work-space.

The developer Matt Parnell created the apt-fast script which increases the speed of the apt-get command by many times by using multiple sources for one file basically it downloads packages in parallel, with multiple connections per package.. In previous tests upgrades that where downloading at 32Kb/s went up to 850Kb/s by just using apt-fast.

You can use apt-fast just like apt-get ( or just forget that apt-get ever existed ) . Apt-fast use the Axel app ( which is a download manager ) to achieve HTTP/FTP acceleration, this will make your ubuntu installations and upgrades up to 26 times faster.

sudo add-apt-repository ppa:apt-fast/stable
sudo apt-get update
sudo apt-get install apt-fast

Close and re-open terminal once again and try to use ‘apt-fast’ instead of ‘apt-get’. You will see the difference. Let us know how it went.

Watch APT-FAST in action