Hi,
from your log:

2020-06-25T06:53:24.803948Z 0 [ERROR] [MY-011300] [Server] Plugin mysqlx 
reported: 'Setup of socket: '/var/run/mysqld/mysqlx.sock' failed, another 
process with PID 22883 is using UNIX socket file'
2020-06-25T06:53:26.068348Z 0 [ERROR] [MY-010259] [Server] Another process with 
pid 22883 is using unix socket file.
2020-06-25T06:53:26.068546Z 0 [ERROR] [MY-010268] [Server] Unable to setup unix 
socket lock file.
2020-06-25T06:53:26.069046Z 0 [ERROR] [MY-010119] [Server] Aborting

I have seen such issues rarely to show up as flaky behavior, but in your
case it seems soemthing else really locks that file still.

You might have a look at running procsses and the last (on a re-install) 
reported PID especially.
Do you have an out-of-archive mysql running in background and/or had a very 
unclean application shutdown that might keep it open?

As trivial as it sounds - if unsure how to clean up a restart might help
as well here.

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https://bugs.launchpad.net/bugs/1885120

Title:
  package mysql-server-8.0 8.0.20-0ubuntu0.20.04.1 failed to
  install/upgrade: installed mysql-server-8.0 package post-installation
  script subprocess returned error exit status 1

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