Thank you for taking the time to file a bug report.
From the logs we can see:
mysqld is running as pid 12852
Error: Unable to shut down server with process id 12852
Do you have by any chance another mysqld process running not managed by
the Debian package provided by Ubuntu? I am asking that because I
searched for PID 12852 in the mysqld error log and this PID is not
referenced there. If you have a mysqld process already running, please
kill it before installing the package.
Since there is not enough information in your report to begin triage or to
differentiate between a local configuration problem and a bug in Ubuntu, I
am marking this bug as "Incomplete". We would be grateful if you would:
provide a more complete description of the problem, 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
** Summary changed:
- package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade:
installed mysql-server-8.0 package post-installation script subprocess returned
error exit status 1
+ package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade:
not able to kill the running mysqld process
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https://bugs.launchpad.net/bugs/1938637
Title:
package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to
install/upgrade: not able to kill the running mysqld process
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