Judging by the following error messages:

2019-11-08T00:42:03.511405Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:04.511750Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:05.512035Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:06.512478Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:07.512850Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:08.513111Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:09.513491Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:10.513937Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:17.615282Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: 
Shutdown complete (mysqld 8.0.17-0ubuntu2)  (Ubuntu).
2019-11-08T00:42:11.515618Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:12.515964Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:13.516251Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:14.516749Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:15.517148Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:16.517627Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock 
./ibdata1 error: 11
2019-11-08T00:42:17.802311Z 0 [Warning] [MY-010068] [Server] CA certificate 
ca.pem is self signed.
2019-11-08T00:42:17.836324Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: 
ready for connections. Version: '8.0.17-0ubuntu2'  socket: 
'/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2019-11-08T00:42:17.978391Z 0 [System] [MY-011323] [Server] X Plugin ready for 
connections. Socket: '/var/run/mysqld/mysqlx.sock' bind-address: '::' port: 
33060
2019-11-08T00:42:49.189401Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: 
Shutdown complete (mysqld 8.0.17-0ubuntu2)  (Ubuntu).
2019-11-08T00:43:13.559226Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld 
(mysqld 8.0.17-0ubuntu2) starting as process 1382
2019-11-08T00:43:14.428696Z 0 [Warning] [MY-010068] [Server] CA certificate 
ca.pem is self signed.
2019-11-08T00:43:14.468187Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: 
ready for connections. Version: '8.0.17-0ubuntu2'  socket: 
'/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).

It looks like an attempt of starting mysql server when there was an
already running instance (thus the ibdata1 unable to lock error).

Could you confirm a way to reproduce this issue and provide us more
information about what happened ? I'm making this as incomplete for now,
feel free to change this bug to "new" again if you are able to provide
us more information.

Thank you

Rafael

** Changed in: mysql-8.0 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1851741

Title:
  package mysql-server-8.0 8.0.17-0ubuntu2 failed to install/upgrade:
  installed mysql-server-8.0 package post-installation script subprocess
  was killed by signal (Terminated)

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