Must one have a knowledge of fine art to be a Graphic Designer? Should all Graphic Designers know how to draw?
Is it true that nice design comes with a nice drawing?
Do designers have to know how to draw to be a good designer or not?
Sketching and drawing are often used as the basis to flesh out designs; it's often useful to have some preliminary designs so you know how text will flow, your proportions, etc. That being said, it's by no means necessary to be able to create those beautiful photorealistic drawings that make us all jealous when we see them.
I'll also start with "bubble drawings"; abstract shapes I move around and fit into the space. This is actually more helpful because once someone sees a strong, well-rendered image they often think that's the final placement rather than a "work in progress".
Like any skill, though, it's one that comes with practice. Get a sketch book and a pencil and doodle, doodle, doodle. Don't worry about what other people think - it's YOUR sketch book. Poke around and find some rendering techniques you like - some people like a hard-edged look, some (like me) a softer, "fill in with shadows" look. As long as you can put your ideas onto paper so YOU can read them you're successfully drawing.