This section describes how to manage software repositories in the currently supported Ubuntu releases: Ubuntu 8.04 (Hardy Heron), Ubuntu 9.04 (Jaunty Jackalope), Ubuntu 9.10 (Karmic Koala), Ubuntu 10.04 (Lucid Lynx) and Ubuntu 10.10 (Maverick Meerkat). For Kubuntu please see Kubuntu repository management.
The operations described on this page modify the software repositories configuration file located at
/etc/apt/sources.list
Software sources can also be managed by making direct modifications to this file using the command line. If you prefer to use the command line instead of a graphical user interface, see Managing Repositories from the Command Line instead.
GUI-based repository management is normally accomplished via "Software Sources". This interface can be accessed via several methods, depending on your version of Ubuntu:
Main Menu: System > Administration > Software Sources.
Firefox 4 is available to download for Windows, Mac OS X and Linux in more than 80 languages. Firefox 4 will also be available on Android and Maemo devices soon.
Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases. Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.
First thing to do after a firefox 4 install is;
go to View -> Toolbars
uncheck "Tabs on Top"
Profit!
Now Firefox is once again consistent with the rest of my desktop.
Less than a month after the Natty Alpha 3, Ubuntu 11.04 beta 1 has just been released. It has come up with many changes both in software and looks. Lets have a quick recap of the new changes in this edition. Before going any further watch this video.
Ubuntu 11.04 Beta 1 Video
What’s New?
Installation
This is not something new in the beta release, it was there since the alpha. But for those who missed it. The installation has be made very simple with the addition of upgrade option.
Another interesting addition is the Gnome classic environment, which allows user to open in the Good-old-Gnome. This can come in handy if your hardware doesn’t support unity.
Resizable Launcher
After much request and patch, the beta come with a resizable Unity Launcher. Now you can finally resize the launcher a minium of 32 pixels and a maximum of 64 keeping 48 pixels default.
Atl + F2? Run
Yes the ‘Alt + F2′ feature which was missing in Alpha 3 has been added in this version. It is very handy and even has a history command.
Test Drive Me!
The Ubuntu Software center now allow s you to test drive softwares before install it (don’t get exited it doesn’t work for all the softwares). Moreover you will need to install a package called “qtnx” in order to activate this feature.
Sound Menu
Well, this is a important change, the Ubuntu Sound Menu is improved. Alongside support for music playerback, playlist selection and volume control comessupport for the adjusting of Microphone levels during voice calls. You notice this when you use Skype or any other VOIP services (Microphone entry appear in the Sound Menu).
Looks
Theres not much difference in the boot screen or the default wallpaper. But the theme has improved a lot. Community Wallpapers of 16 Wallpapers has been added.
What else? Any Changes
Other changes in Ubuntu 11.04 beta since alpha 3
changes to the Ubuntu One look
double clicking top panel restores maximized window
Dash suggests applications you may want to install; clicking such an application will open the Ubuntu Software Center
the Unity launcher now supports drag’n'drop
you can now drag icon to the trash to remove it
Dash got a blur option
Pressing ALT + F2 and entering “about:config” will launch the Unity settings in CCSM
NOTE: I wouldn’t bet on the stability. My compiz keeps crashing, leaving Ubuntu unstable. Lets wait for the final release on April 28th.
09.30
Akh. Fauzy
Software sources can also be managed by making direct modifications to this file using the command line. If you prefer to use the command line instead of a graphical user interface, see Managing Repositories from the Command Line instead. 
