The log out/shut down button is not responding to clicks. Tried:
** (gnome-session-quit:1782): WARNING **: Failed to call logout: The name org.gnome.SessionManager was not provided by any .service files
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you can use this command as Normal user not root. this will kill all processes and send you back to login window
kill -9 -1
"A PID of -1 is special; it indicates all processes except the kill process itself and init."
Read this for more info