Thank you for reporting this bug.
In your Logs.var.log.mysql.error.log.txt attachment I see this message,
which likely describes the root cause of the issue:
2025-07-15T10:38:58.347948Z 0 [ERROR] [MY-010262] [Server] Can't start server:
Bind on TCP/IP port: Address already in use
2025-07-15T10:38:58.347960Z 0 [ERROR] [MY-010257] [Server] Do you already have
another mysqld server running on port: 3306 ?
Can you check if there's another instance of mysql running using "sudo netstat
-nlp | grep :3306"? Or maybe it might be the maintainerscript restarting mysql
and the timeout being too small for it to confirm the authentication plugin.
This is likely related to bug #1921378
** Changed in: mysql-8.4 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2116933
Title:
package mysql-server 8.4.5-0ubuntu0.2 failed to install/upgrade
(another mysqld server running on port: 3306 ?)
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