Thank you for taking the time to file a bug report.
It seems you already found the root cause of the problem and fixed it.
Since this is not a bug in Ubuntu I am marking this bug as Invalid.
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Invalid
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So evidently the problem was an existing mysql.cnf with configuration
data that had been removed from this version of mysql.
NO_AUTO_CREATE_USER I think along with two other ones which I don't
remember. Something like some_cache=4m. Once I found them in the mysql
error log and removed them one by
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1935792
Title:
package mysql-server-8.0 8.0.25-0ubuntu0.20.04.1 failed to
install/upgrade: installed
