Enable the key combination Ctrl+Alt+Backspace
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Open the Terminal and run
gksu pluma /etc/default/keyboard
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Find the line:
XKBOPTIONS=""
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Replace it with:
XKBOPTIONS="terminate:ctrl_alt_bksp"
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Save the modified file and close it.
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Reboot your computer to take affect.
For those who don’t know the key combination Ctrl+Alt+Backspace use to be enabled by default in previous version of Ubuntu. When pressed, this key combination will drop you back to the login screen. This is useful if for some reason your system become unresponsive. However, any unsaved work will be lost. So you need to take this possibility into account before you enable this function.