When developing a project, you may want to keep a version control of all your files so that you can easily revert to an earlier page (or the previous revision) to fix any bugs or in the event that someone accidentally deleted your files.
In Ubuntu, the easiest way to do version control is to set up a Subversion (SVN) server.
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Popularity: 2% [?]
If you have installed CompizConfig Setting Manager in you Ubuntu, you can easily activate the widget-layer plugin and hide/show your desktop widgets in a Mac dashboard style.
In addition, with some simple configuration, you can also turn any windows/applications into widgets so that they can run in the background (such as playing music) without messing up your desktop. This can also be very useful if you are frequently watching/reading porn confidential stuffs. When someone (such as your boss) walks in, you can quickly hide it without them seeing it.
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Popularity: 4% [?]
The KDE community has officially announced the release of KDE 4.1. This second feature release of the KDE4 contains many bug fixes, added more applications and also polished up the Plasma desktop to make it even more stunning. On the same day, the Ubuntu team has also released a package for its users to upgrade to the new KDE 4.1. Ubuntu GNOME users can also install KDE4.1 and run alongside their GNOME desktop.

Screenshot from KDE
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Popularity: 5% [?]
For Linux users those who like to impress their friends with the the awesome Compiz eye candy and desktop effects, here is another new trick that you can show: make your desktop rotate as a cylinder or sphere.
With the release of latest version of Compiz Fusion 0.7.6, many new plugins and eye candys have been added. Rather than the usual desktop cube rotation, you can now rotate your desktop as cylinder or sphere.

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Popularity: 5% [?]
You can’t really turn a Linux system to a Mac, but you definitely can make your Ubuntu Hardy looks like a Mac OSX Leopard.
If you want to change this
into
, follow the steps below.
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Popularity: 100% [?]
If you love Ubuntu, but wanted a lightweight version for your older computer, then WattOS maybe what you are looking for.
WattOS is a new lightweight Linux distribution that has low power requirement and can be used on computer with older hardware. It is in fact, a stripped down version of Ubuntu, with many of the heavy-duty applications such as OpenOffice removed, and/or replaced with a faster and smaller alternative.
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Popularity: 16% [?]

For those shortcut key lovers out there, here is a long list of keyboard shortcuts for Ubuntu Hardy. Most of them should work in the previous version of Ubuntu as well. Enjoy the list.
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Popularity: 20% [?]
After upgrading to Firefox 3, if you find that you cannot get java to run and you are 100% sure that you have already installed the latest version of java, here is a simple fix (for Ubuntu Hardy Heron).
Open up your Terminal (Applications->Accessories->Terminal).
Type the command
sudo apt-get autoremove icedtea-gcjwebplugin
to remove the icedtea-gcjwebplugin package from your system.
Restart your Firefox 3. The Java runtime should be working now.
(icedtea-gcjwebplugin is a little web browser plugin to execute Java applets. It is targeted for Mozilla and compatible browsers that support the NPAPI. It seems that this has some compatibility issue with Firefox 3.)
Popularity: 25% [?]
Reconstructor is an Ubuntu GNU/Linux CD Creator that allows you to modify an existing Ubuntu distribution and save as your own Linux distribution. It uses the Desktop(Live), Alternate(Install), or Server disc as a base, and then allows for user customization.
You can basically customize the entire environment, such as add/remove software, change the default look (splash, themes, fonts, wallpaper, etc.), add desktop links, etc.
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Popularity: 42% [?]
Often, you have heard a rare nice song from a particular YouTube video and you wish you could just save that song (without the video) into your hard disk. Well, in Ubuntu, you can use UTube Ripper to extract audio from YouTube video and save it as mp3 file.
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Popularity: 43% [?]