Comment 7 for bug 1899248

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Lars Tangvald (lars-tangvald) wrote : Re: package mysql-server-8.0 8.0.21-0ubuntu0.20.04.4 failed to install/upgrade: installed mysql-server-8.0 package post-installation script subprocess returned error exit status 1

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.