Thank you for taking the time to file a bug report.
In the logs I can see this error:
mysqld is running as pid 23042
Error: Unable to shut down server with process id 23042
Which means the post installation script was not able to stop this
mysqld process. Checking the mysql error logs I cannot find any
reference to the pid 23042, did you start an instance of mysql in a way
different than using the debian package coming from the Ubuntu archive?
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/1904459
Title:
package mysql-server-8.0 8.0.22-0ubuntu0.20.04.2 failed to
install/upgrade: el subproceso instalado paquete mysql-server-8.0
script post-installation devolvió el código de salida de error 1
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