Thank you for taking the time to file a bug report.
The error in the log is the following:
Setting up mysql-server-8.0 (8.0.23-0ubuntu0.20.04.1) ...
update-alternatives: error: alternative path /etc/mysql/mysql.cnf doesn't exist
[1mdpkg:[0m error processing package mysql-server-8.0 (--configure):
installed mysql-server-8.0 package post-installation script subprocess
returned error exit status 2
Which means /etc/mysql/mysql.cnf is not available at the moment of the
configuration. Didn't you move this file to another directory by
mistake? In default mysql installations this file is present.
FWIW I was able to upgrade to version 8.0.23-0ubuntu0.20.04.1 in a LXD
container without any issue.
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/1927982
Title:
package mysql-server-8.0 (not installed) failed to install/upgrade:
installed mysql-server-8.0 package post-installation script subprocess
returned error exit status 2
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