From the logs, looks like you have another service listening on the mysql port:
2026-02-08T20:28:39.843329Z 0 [ERROR] [MY-010262] [Server] Can't start server:
Bind on TCP/IP port: Address already in use
2026-02-08T20:28:39.843340Z 0 [ERROR] [MY-010257] [Server] Do you already have
another mysqld server running on port: 3306 ?
And I would guess it's the "mysql-strict" snap, given these other logs:
[ 2561.782448] audit: type=1326 audit(1770581470.470:2467):
auid=4294967295 uid=584788 gid=0 ses=4294967295 subj=snap.mysql-
strict.mysqld pid=58801 comm="ib_buf_create" exe="/snap/mysql-
strict/198/usr/bin/mysqld" sig=0 arch=c000003e syscall=203 compat=0
ip=0x75c1ea3db6f1 code=0x50000
You should only have one mysql installed.
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2141255
Title:
package mysql-server-8.0 8.0.45-0ubuntu0.24.04.1 failed to
install/upgrade: o subprocesso instalado, do pacote mysql-server-8.0,
o script post-installation retornou erro do status de saída 1
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