There are several applications available for recording your desktop (screencasting) in Linux. The most popular method is recordmydesktop, with both KDE and GTK frontends. Some other, less popular applications for this purpose include XVidCap (useful because you can select a specific area and size to record) and VLC. KDE 4 includes an application for recording the desktop built-in, although the output file isn't very compatible with most media players and will need to be converted.
You can use the frontend, qt-recordMyDesktop, or XVidCap. I would personally recommend recordMyDesktop, unless you need to record only a certain area of the screen.
Desktop environments.
K Desktop Environment
Originally, it was meant to stand for "Kool." It now does not stand for anything, thus making KDE stand for "K Desktop Environment."
there are too many Gnome, unity, kde, ....
desktop
Kubuntu is Ubuntu packaged with the KDE Plasma desktop environment. KDE is known for its fancy looks, bundled with the popularity and support of Ubuntu.
Everything will still work. However gnome applications do not interact with the desktop environment of KDE as well as they would with gnome. The differences will be mainly superficial. You can always remove the gnome applications later and replace them with kde ones if you want.
KDE stands for K Desktop Environment (the K originally stood for Kool) and is useful on Linux systems to provide a Windows-like appearance to the user.
GNOME and KDE.
There is no "default" in the sense that Fedora provides only one out of the box, or even one at all. The main "Desktop Edition" disc uses GNOME, but the project also provides discs for KDE, LXDE, and XFCE, as well as a CLI-only installation.
There are many desktop environments in linux. Most prominent would be: KDE Trinity - KDE fork (response to KDE 4.0 dissatisfaction) Gnome MATE - Gnome fork (response to Gnome 3.0 dissatisfaction) Cinnamon - Gnome fork (response to Gnome 3.0 dissatisfaction) Unity - Ubuntu's desktop environment (built on top of Gnome 3.0) XFCE LXDE There are many more. Also, there are window managers that have comparable functionality (ex. Enlightenment)
A decent portion of the KDE desktop can be installed without installing its applications, although this makes little sense since GTK+ applications don't really look right in KDE. You should be able to do this by using the commandsudo apt-get install kdm kde-baseP.S. The version of KDE in the 8.10 (Intrepid) repository is very old and known to have a lot of bugs fixed in later versions. Unless you have a very good reason not to, you should upgrade to a later relase.