>From your log:
2020-07-31T15:01:02.904484Z 0 [ERROR] [MY-010262] [Server] Can't start server:
Bind on TCP/IP port: Address already in use
2020-07-31T15:01:02.904814Z 0 [ERROR] [MY-010257] [Server] Do you already have
another mysqld server running on port: 3306 ?
It seems another service (or even a different mysql than the one from
Ubuntu packages) is already running and blocking the service start that
is part of the installation.
You'd need to check open ports what currently holds the port and resolve
that before re-trying the installation.
This doesn't (yet) seem like a packaging bug, setting to incomplete but
feel free to report back with more info if it turns out that you believe
it is indeed a bug and not just a config issue due to that yet unknown
other service.
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1889793
Title:
package mysql-server-8.0 8.0.21-0ubuntu0.20.04.3 failed to
install/upgrade: installed mysql-server-8.0 package post-installation
script subprocess returned error exit status 1
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