Hi,
it seems the sever has a stored routine which is wrong and fails on 
(re-)initialization:
Form your log:

2020-10-10T06:59:14.876648Z 2 [ERROR] [MY-013235] [Server] Error in parsing 
Routine 'park'.'abl_bbc_data_migrate_proc' during upgrade. You have an error in 
your SQL syntax; check the manual that corresponds to your MySQL server version 
for the right syntax to use near 'row_number,@client_desc:=trim(description) AS 
client_desc
                FROM (SELECT * FROM ' at line 80
2020-10-10T06:59:33.461878Z 0 [ERROR] [MY-010022] [Server] Failed to Populate 
DD tables.
2020-10-10T06:59:33.463160Z 0 [ERROR] [MY-010119] [Server] Aborting
2020-10-10T06:59:35.096658Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld 
(mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 4710
2020-10-10T06:59:35.151748Z 1 [System] [MY-013576] [InnoDB] InnoDB 
initialization has started.
2020-10-10T06:59:35.712050Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2020-10-10T06:59:36.713352Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2020-10-10T06:59:37.713698Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11

It seems this failed before the upgrade as well, but an upgrade implies
a service restart and hence the upgrade fails.

You'd need to check what is bad "in the DB" so that it can properly (re)start 
again.
Once resolved you should also be able to upgrade just fine.

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https://bugs.launchpad.net/bugs/1899241

Title:
  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

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