To simplify the given expression, we first need to factor out the denominators and simplify as much as possible.

Starting with the expression:
(2/b^2x - 4x - x/b^3 - 4b - 1/b^2 + 2b) / (x^2 - 4x + 4)/(b^3x - 4bx)

First, simplify the numerator:
= (2/b^2x - x/b^3 - 1/b^2 - 4x - 4b + 2b)

Next, find a common denominator for all the terms in the numerator. The common denominator can be b^3b^2 = b^5.
= (2b^3/ b^5 - b^5/ b^5 - b^4/ b^5 - 4b^2/ b^5 - 4b^3/ b^5 + 2b^5/b^5)

Simplify each term:
= (2b^3 - b^5 - b^4 - 4b^2 - 4b^3 + 2b^5)/b^5

Combine like terms:
= (-b^5 - b^4 + 2b^5 - 2b^3 - 4b^2) / b^5

Now, simplify the denominator:
= (x - 2)^2 / b^2(x - 4)

To simplify the overall expression:
= (-b^5 - b^4 + 2b^5 - 2b^3 - 4b^2) / b^5 * b^2(x - 4)/(x - 2)^2

= (-b^5 - b^4 + 2b^5 - 2b^3 - 4b^2) b^2 / b^5 (x - 4) / (x - 2)^2

= (-b^3 - b^4 + 2b^3 - 2 - 4) * b^2 / (x - 4) / (x - 2)^2

= (-b^3 + b^2 - 6) * b^2 / (x - 4) / (x - 2)^2

Therefore, the simplified expression is:
(-b^3 + b^2 - 6) * b^2 / (x - 4) / (x - 2)^2