I'm using Ubuntu and I would like to experience KDE desktop environment. I have installed KDE in full mode using
apt-get install with no error but no further effects occurred. I don't know how to use my installation, start in KDE mode and switch between unity and KDE.
To install KDE (which it sounds like you may have already done), you install one of the following packages:
Selecting KDE when logging in
Hi when you are at the login screen there you can choose wich desktop you want to use like in the screenshot here