MySQLdが動かないので修正

以下のmysqlのログ見るに、/var/lib/mysql

$ sudo vim /var/log/mysql/error.log
2022-07-24T10:46:07.641883Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.29-0ubuntu0.22.04.2) initializing of server in progress as process 1069697
2022-07-24T10:46:07.646856Z 0 [ERROR] [MY-010457] [Server] --initialize specified but the data directory has files in it. Aborting.
2022-07-24T10:46:07.646994Z 0 [ERROR] [MY-013236] [Server] The designated data directory /var/lib/mysql/ is unusable. You can remove all files that the server added to it.
2022-07-24T10:46:07.647182Z 0 [ERROR] [MY-010119] [Server] Aborting

なので、 /var/lib/mysql の中身全部消して作り直した。

$ sudo rm -rf /var/lib/mysql
$ sudo mkdir /var/lib/mysql
$ sudo chown mysql:mysql /var/lib/mysql/
$ sudo chmod 777 /var/lib/mysql
$ sudo mysqld --initialize