Copy/Paste/Cut shortcuts don't work on Linux

[Serge2005]

Hi all!

I build CB-16.01 and all plugins from source-code successfully on Linux (LMDE2), it works OK.
But "Copy/Paste/Cut" shortcuts are disabled.
I tried to switch them on  (Settings->Editor->Keyboard shortcuts) but it doesn't let me enter key after Ctrl-button.

What is wrong? Is this a bug or am I doing something incorrectly?