What happened?
Let’s say I want to redo something, press ctrl+r, in the bottom bar, I see C-s-r is undefined.
This is happening to all commands involving ctrl.
What did you expect to happen?
I’d see C-r displayed in bottom bar and redo action would occur.
Am I misunderstanding something somewhere?
Researching I found ways to customize a single shortcut, for example I could remap redo to C-s-r, but I want to be able to use the ctrl key normally for all commands.
Thanks a lot for any suggestion 
System information
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In case that’s relevant info, I’m customizing a bit Xmodmap with the following:
add Control = Super_L Super_R
So the key I’m pressing to have ctrl actions is my keyboard’s super key.