I don’t know if you already found the answer or not, but since this is the first link I received from google on the same problem I found today (after updating to 04/14/2), and there is no one who is answering this question , so that’s how I solve the problem, just in case someone interrogates her.
I remove mysql-apt-config with dpkg without using apt. Here's how to do it.
sudo dpkg --purge mysql-apt-config
Hope that helped someone else: D
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