1 Pressing Ctrl+Alt+Backspace on my keyboard restarts the X server, losing all my work.
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3 Reason is that the package ``ubuntu-mate-default-settings`` ships a file ``/usr/share/X11/xorg.conf.d/90-zap.conf``, which sets this setting.
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5 Bug report: https://bugs.launchpad.net/ubuntu-mate/+bug/1515968