Hi,
I'm running Linux Mint 20 Ulyana 64-bit and upgraded CQRLOG to latest version 2.4.0 (001) via command line from CQRLOG's website, now CQRLOG is failing to start, complaining about SQL, attached are the lines from myqsl.err file. How Can I fix this?
73' Pawel

Error during connection to database: TMySQL57Connection : Server connect failed.

2020-08-14T06:07:51.427576Z 0 [ERROR] [MY-010119] [Server] Aborting
2020-08-14T06:07:51.428346Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.21-0ubuntu0.20.04.4) (Ubuntu).
2020-08-14T09:25:14.796026Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 11439
2020-08-14T09:25:14.797360Z 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.
2020-08-14T09:25:14.797377Z 0 [Warning] [MY-013244] [Server] --collation-server: 'utf8_bin' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
2020-08-14T09:25:14.811764Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.
2020-08-14T09:25:14.812036Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2020-08-14T09:25:14.812156Z 0 [ERROR] [MY-010119] [Server] Aborting
2020-08-14T09:25:14.812872Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.21-0ubuntu0.20.04.4) (Ubuntu).
2020-08-14T09:30:50.729449Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 11557
2020-08-14T09:30:50.730795Z 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.
2020-08-14T09:30:50.730812Z 0 [Warning] [MY-013244] [Server] --collation-server: 'utf8_bin' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
2020-08-14T09:30:50.745699Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.
2020-08-14T09:30:50.745935Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2020-08-14T09:30:50.746080Z 0 [ERROR] [MY-010119] [Server] Aborting
2020-08-14T09:30:50.746751Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.21-0ubuntu0.20.04.4) (Ubuntu).