Pressing Ctrl+Alt+Backspace on my keyboard restarts the X server, losing all my work.
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.
Bug report: https://bugs.launchpad.net/ubuntu-mate/+bug/1515968
1 2 3 | Section "ServerFlags" Option "DontZap" "true" EndSection |
1 2 3 4 5 6 | Section "InputClass" Identifier "keyboard defaults" MatchIsKeyboard "on" Option "XKbOptions" "terminate:ctrl_alt_bksp" EndSection |