Restart KDE without rebooting the computer
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Save and close all open applications.
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Use the Ctrl-Alt-Backspace shortcut keys to restart KDE.
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If Ctrl-Alt-Backspace is disabled, type
sudo /etc/init.d/kdm restart
(See the section called "Preventing the Ctrl-Alt-Backspace shortcut keys from restarting X" to disable Ctrl-Alt-Backspace.)
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