kde restart ...

how to upgrade kde

http://www.fandigital.com/2012/08/install-latest-kde-in-ubuntu-kubuntu.html

Restart KDE without rebooting the computer

• Save and close all open applications.
  
• Use the Ctrl-Alt-Backspace shortcut keys to restart KDE.
  
• If Ctrl-Alt-Backspace is disabled, type
  

  sudo /etc/init.d/kdm restart