KDE is the most brilliant Linux desktop, which is open-source and free. Currently, KDE is rarely used as the main desktop version in several major versions, but KDE is still the most beautiful Linux Desktop, if you are using KUbuntu, we recommend that you upgrade your desktop because the latest version of KDE 4.11.1 has fixed more than 70 bugs: There are many stability fixes and commonly used language translations, improvements include dragging back from the taskbar, using less memory for various applications and tools, and improving the File Manager.
(K) Ubuntu 13.04, (K) Ubuntu 12.10, (K) Ubuntu 12.04 system upgrade command:
Sudo add-apt-repository ppa: kubuntu-ppa/backports
Sudo apt-get update
Sudo apt-get upgrade
Gorgeous desktop KDE 4.11 released
KDE details: click here
KDE: click here
Recommended reading:
Kubuntu 12.04 (KDE) sets the Brightness and touchpad