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In recently released transcripts of a phone call conversation between President Trump of the United States and President Zelenskyy of Ukraine, President Trump makes the following statement

There's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the Attorney General would be great. Biden went around bragging that he stopped the prosecution so if you can look into it... It sounds horrible to me.

Is this an accurate summary of what happened?

Biden bragged about getting a prosecutor (Viktor Shokin) fired, by threatening to withhold aid to Ukraine. A video and transcript are available here:

I remember going over and convincing our team, others, to convince that we should be providing for loan guarantees. And I went over, I guess, the 12th, 13th time to Kiev. And I was supposed to announce that there was another billion-dollar loan guarantee. And I had gotten a commitment from Poroshenko and from Yatsenyuk that they would take action against the state prosecutor. And they didn’t.

So they said they had—they were walking out to a press conference. I said, nah, I’m not going to—or, we’re not going to give you the billion dollars. They said, you have no authority. You’re not the president. The president said—I said, call him. (Laughter.) I said, I’m telling you, you’re not getting the billion dollars. I said, you’re not getting the billion. I’m going to be leaving here in, I think it was about six hours. I looked at them and said: I’m leaving in six hours. If the prosecutor is not fired, you’re not getting the money. Well, son of a bitch. (Laughter.) He got fired.

Biden did not say that the prosecutor was investigating or prosecuting Biden's son.

However, according to an April 2019 article the prosecutor Shokin is quoted as saying that before being fired he had specific plans for:

interrogations and other crime-investigation procedures into all members of the executive board, including Hunter Biden

See also this May interview of Viktor Shokin.

Overall, yes Biden bragged about threatening to withhold aid in order to get a prosecutor fired, but there is no proof that Biden's son was the reason for this coercion.

The US desire to have Shokin removed was echoed by the EU. He was viewed as either incompetent or himself corrupt (note, this source is generally considered conservative to right-wing). (See also Washington Post)

It also fails to mention that the investigation into Hunter Biden's company was either stalled or abandoned already, at the time Shokin was dismissed. Whether that is because there is nothing corrupt about it, or because Shokin didn't prosecute even corruption he wasn't involved in, has probably not been determined. The current Ukrainian government seems to think there was no corruption (source is left-liberal and anti-Trump).