As is evident from the quality of the photograph I hereby present, I am not a Pro. Heck. I don't even come close to my 5th grade cousin.
But I am OK with my favourite photo editor GIMP. So I tried developing a technique similar to the Unsharp Mask filter. All out of trial and error, so I don't guaranty anything. I have noticed it only reduces soft motion blur. So take a backup of the images you try this on. You have been warned.
( I found that the steps apply much better to the following images :
So here goes nothing.
Select your camera shake affected photograph and move on to the next step.
Step 1: Measure the blur.
Step 2: Triplicate the layer.
Don't ask me exactly how I came up with this. It was a bit of looking in the code of "unsharp mask" filter and a lot of trial and error.