Thank you for taking the time to file a bug report.
@guiverc is right, this seems to me a local configuration issue.
In the logs I see you first installed mariadb and then after you
installed mysql, both are not co-installable, please make sure you do
not have them installed. Moreover, in the mysql logs you can seem more
than one occurrence of the following:
2021-11-06 18:43:51 0 [ERROR] InnoDB: Invalid flags 0x4800 in ./ibdata1
2021-11-06 18:43:51 0 [ERROR] InnoDB: Plugin initialization aborted with error
Data structure corruption
2021-11-06 18:43:51 0 [Note] InnoDB: Starting shutdown...
2021-11-06 18:43:52 0 [ERROR] Plugin 'InnoDB' init function returned error.
2021-11-06 18:43:52 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE
failed.
2021-11-06 18:43:52 0 [Note] Plugin 'FEEDBACK' is disabled.
2021-11-06 18:43:52 0 [ERROR] Could not open mysql.plugin table. Some plugins
may be not loaded
2021-11-06 18:43:52 0 [ERROR] Unknown/unsupported storage engine: InnoDB
2021-11-06 18:43:52 0 [ERROR] Aborting
It seems your data is corrupted or an issue with some plugin. Please,
follow the instructions in the logs and check the upstream doc:
2021-11-06T19:56:34.402162Z 1 [ERROR] [MY-012530] [InnoDB] Unknown redo
log format (103). Please follow the instructions at
http://dev.mysql.com/doc/refman/8.0/en/ upgrading-downgrading.html.
Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.
However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".
For local configuration issues, you can find assistance here:
http://www.ubuntu.com/support/community
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1950057
Title:
package mysql-server-8.0 8.0.27-0ubuntu0.20.04.1 failed to
install/upgrade: installed mysql-server-8.0 package post-installation
script subprocess returned error exit status 1
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