Custom shortcut Ctrl + Shift + Esc doesn't fire the event
For some reason there is a problem using Esc key within Custom shortcuts. Here is the same (unanswered) question: Ubuntu 16.04 escape key doesn't work in custom keyboard shortcut. I found also this question: Keyboard shortcut Shift + Ctrl + Escape does not work, where in the comments @Cas says: I have opened a bug report: #1350527.
Мy suggestion is to use another key combination, for example Ctrl+Alt+Z, and command to be executed: gnome-system-monitor.
