Exakt das was in dem Link steht.
Fehlermeldung:
2022-08-13T19:10:56.525165Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2022-08-13T19:10:56.525578Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2022-08-13T19:10:56.525887Z 0 [ERROR] [MY-010119] [Server] Aborting
2022-08-13T19:10:56.526527Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.19-0ubuntu5) (Ubuntu).
2022-08-13T19:10:57.057779Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.19-0ubuntu5) starting as process 7723
2022-08-13T19:10:57.516428Z 1 [ERROR] [MY-013171] [InnoDB] Cannot boot server version 80019 on data directory built by version 80030. Downgrade is not supported
mysqld: Can't open file: 'mysql.ibd' (errno: 0 - )
2022-08-13T19:11:02.516729Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2022-08-13T19:11:02.517112Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2022-08-13T19:11:02.517431Z 0 [ERROR] [MY-010119] [Server] Aborting
2022-08-13T19:11:02.518083Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.19-0ubuntu5) (Ubuntu).
2022-08-13T19:11:03.318966Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.19-0ubuntu5) starting as process 7755
Lösungsweg:
CT auf nen anderen Pool verschieben, dann:
dd if=/dev/zero bs=1 count=8192 of=./zeros
cat zeros >> /var/lib/mysql/#innodb_redo/#ib_redo18
systemctl restart mysql.service
wieder der gleiche Fehler. Downgrade habe ich auch probiert. Kommt leider auch der gleiche Fehler.