How to Install KDE SC 4.11 on Ubuntu 13.04 and 12.04 LTS

The following tutorial was created especially for those of you who want to install KDE SC 4.11 on their Ubuntu 13.04 (Raring Ringtail) and Ubuntu 12.04 LTS (Precise Pangolin) machines. In other words, this guide will teach you how to install KDE SC 4.11 on top of your existing Ubuntu installation. After another six months of hard work, the famous KDE Software Compilation (SC) suite reached version 4.11 on August 14, 2013, bringing improvements to the KDE Plasma Workspace, the KDE Applications and the KDE Development Platform. KDE Software Compilation 4.11 comes loaded with many interesting and new features, updated applications, new technologies and functionality, as well as breath-taking effects, which can be viewed in the official release announcement.