I apologize for the simplicity of this question.
When I am in an install wizard, how can I check the check boxes using only a keyboard? I have tried every conceivable keyboard command. +, -, Enter, <, >, 1, 2, 3 etc.
You can check checkboxes using Spacebar in most of the interfaces.
I would rather write an answer than to close this question as off-topic (in which queue I found it), because there is nothing wrong in it.