Greetings and How do I kill the x server

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Author: Jim
Date:  
To: plug-discuss
Subject: Greetings and How do I kill the x server
I have a problem killing the x server.  I have Kubuntu 18 installed. 
I've gone into system settings / input devices / keyboard and enabled
the option to kill the x server using control alt backspace, but it
doesn't work.  I created another user account and it works if I'm logged
in as the other user.  I know I could nuke all this account's settings
and start from scratch, but I have this account configured like I like
except for the ability to kill the x server.  Does anyone have any idea
what file needs to be edited or deleted, or is there something else?  Thanks
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