Looking at that part of the postinst code, we have some oold logic for doing server shutdowns that waits a second for mysqld to stop, and 8.0 is slower to startup and shutdown than older versions, so it may simply be hitting a timeout without there strictly being anything wrong.
Looking at that part of the postinst code, we have some oold logic for doing server shutdowns that waits a second for mysqld to stop, and 8.0 is slower to startup and shutdown than older versions, so it may simply be hitting a timeout without there strictly being anything wrong.