*** This bug is a duplicate of bug 1612517 ***
    https://bugs.launchpad.net/bugs/1612517

>From your logs:
ERROR: Unable to start MySQL server:
2020-12-04T16:13:25.340543Z 0 [Warning] [MY-011068] [Server] The syntax 
'expire-logs-days' is deprecated and will be removed in a future release. 
Please use binlog_expire_logs_seconds instead.
2020-12-04T16:13:25.340557Z 0 [ERROR] [MY-000077] [Server] /usr/sbin/mysqld: 
Error while setting value 
'IGNORE_SPACE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
 to 'sql_mode'.
2020-12-04T16:13:25.341653Z 0 [ERROR] [MY-010119] [Server] Aborting


2020-12-04T15:43:02.089483Z 0 [Warning] TIMESTAMP with implicit DEFAULT value 
is deprecated. Please use --explicit_defaults_for_timestamp server option (see 
documentation for more details).
2020-12-04T15:43:02.089558Z 0 [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 
'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They 
will be merged with strict mode in a future release.


All those things indicate a configuration which has to be adapted after the 
upgrade to a new major version.
For sql-mode in particular I'd look at
https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1864958

Since you have NO_AUTO_CREATE_USER I'd assume it is the same case.


** This bug has been marked a duplicate of bug 1864958
   package mysql-server-8.0 8.0.19-0ubuntu0.19.10.3 failed to install/upgrade: 
installed mysql-server-8.0 package post-installation script subprocess returned 
error exit status 1

** This bug is no longer a duplicate of bug 1864958
   package mysql-server-8.0 8.0.19-0ubuntu0.19.10.3 failed to install/upgrade: 
installed mysql-server-8.0 package post-installation script subprocess returned 
error exit status 1
** This bug has been marked a duplicate of bug 1612517
   Server fails to start after upgrade because of customized config and 
obsolete/renamed directives

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https://bugs.launchpad.net/bugs/1906853

Title:
  package mysql-server-8.0 8.0.22-0ubuntu0.20.04.3 failed to
  install/upgrade: installed mysql-server-8.0 package post-installation
  script subprocess returned error exit status 1

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