In this post I will show you how to install the kde desktop on Debian 7 (wheezy). The packages for the kde desktop are available in the default repository of debian and can be installed directly from synaptic or apt-get.
There are 3 different sized kde desktop packages that can be installed depending on your needs.
kde-plasma-desktop < kde-standard < kde-full [/pre]
# apt-get install kde-plasma-desktop
The kde-plasma-desktop is the minimal sized installation of the kde desktop. It will download around 258MB of packages.
If you want more software packages in the KDE installation you can try installing the kde-standard package.
# apt-get install kde-standard
This will download around 335MB of package archives. This includes more applications compared to the previous packages.
If you want to complete set of applications of the KDE desktop suite, then install the kde-full package.
# apt-get install kde-full
This will download around 884MB of archives and installed all applications of the KDE desktop suite.
You can always install additional packages later on. The packages mentioned above are virtual packages that indicate how many actual packages should be installed.
After installation, restart. On the login page, select KDE Plasma as the session and the you should be logged into the KDE desktop right away.