уметь (to be able to) So, this implies that you are not able to read.
This is a very different meaning to "Я не могу читать", where you are able to but you can't do it (because you are doing something else).
That would mean, for example, that the person speaking is blind or has no time for reading, i.e. impossibility, not the lack of the necessary skill.
yes, but on the other hand, 'I can't read' does not always mean 'I don't know how to read'. It can mean 'I can't read it because the text is blurred or is too small.