Moin,

I updated my linux box from Ubuntu 22.04 to 24.04. Bur cqrlog won't start any longer. There is a problem with the database, but the directory ~/.config/cqrlog/ looks good so far.

2024-12-20T15:46:48.075039Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.40-0ubuntu0.24.04.1) starting as process 87455
2024-12-20T15:46:48.076464Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
2024-12-20T15:46:48.076476Z 0 [Warning] [MY-013244] [Server] --collation-server: 'utf8mb3_general_ci' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
2024-12-20T15:46:48.090093Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.
2024-12-20T15:46:48.090207Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2024-12-20T15:46:48.090234Z 0 [ERROR] [MY-010119] [Server] Aborting
2024-12-20T15:46:48.091014Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.40-0ubuntu0.24.04.1) (Ubuntu).
2024-12-20T15:51:13.948278Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.40-0ubuntu0.24.04.1) starting as process 90632
2024-12-20T15:51:13.949345Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
2024-12-20T15:51:13.949358Z 0 [Warning] [MY-013244] [Server] --collation-server: 'utf8mb3_general_ci' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
2024-12-20T15:51:13.967778Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.
2024-12-20T15:51:13.967929Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2024-12-20T15:51:13.967949Z 0 [ERROR] [MY-010119] [Server] Aborting
2024-12-20T15:51:13.968408Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.40-0ubuntu0.24.04.1) (Ubuntu).

Database version is 8.0:
renner@solaris:~$ dpkg --list | grep mysql
rc akonadi-backend-mysql 4:24.12.0-0zneon+24.04+noble+release+build19 amd64 MySQL storage backend for Akonadi
ii default-mysql-server 1.1.0build1 all MySQL database server binaries and system database setup (metapackage)
ii libmysqlclient21:amd64 8.0.40-0ubuntu0.24.04.1 amd64 MySQL database client library
ii libqt5sql5-mysql:amd64 5.15.16+p24.04+vrelease+git20241207.0024-0 amd64 Qt 5 MySQL database driver
ii libreoffice-sdbc-mysql 4:24.2.7-0ubuntu0.24.04.1 amd64 MariaDB/MySQL SDBC driver for LibreOffice
ii mariadb-common 1:10.11.8-0ubuntu0.24.04.1 all MariaDB database common files (e.g. /etc/mysql/mariadb.conf.d/)
ii mysql-client-8.0 8.0.40-0ubuntu0.24.04.1 amd64 MySQL database client binaries
ii mysql-client-core-8.0 8.0.40-0ubuntu0.24.04.1 amd64 MySQL database core client binaries
ii mysql-common 5.8+1.1.0build1 all MySQL database common files, e.g. /etc/mysql/my.cnf
ii mysql-server-8.0 8.0.40-0ubuntu0.24.04.1 amd64 MySQL database server binaries and system database setup
ii mysql-server-core-8.0 8.0.40-0ubuntu0.24.04.1 amd64 MySQL database server binaries

Any hint?

vy73 de Micha, DD0UL