已解决，应该是用一键安装包删除了一些文件 重装系统后直接安装好了
安装mariadb后 报错
运行这个命令的时候就报错了
sudo mysql_secure_installation
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
查看状态显示
mariadb.service - MariaDB Server
Loaded: loaded (/etc/systemd/system/mariadb.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2021-01-20 19:57:35 CST; 1min 18s ago
Process: 7687 ExecStart=/etc/init.d/mariadb start (code=exited, status=203/EXEC)
1月 20 19:57:35 raspberrypi systemd[1]: Starting MariaDB Server...
1月 20 19:57:35 raspberrypi systemd[7687]: mariadb.service: Failed to execute command: No such file or directory
1月 20 19:57:35 raspberrypi systemd[7687]: mariadb.service: Failed at step EXEC spawning /etc/init.d/mariadb: No such file or directory
1月 20 19:57:35 raspberrypi systemd[1]: mariadb.service: Control process exited, code=exited, status=203/EXEC
1月 20 19:57:35 raspberrypi systemd[1]: mariadb.service: Failed with result 'exit-code'.
1月 20 19:57:35 raspberrypi systemd[1]: Failed to start MariaDB Server.
sudo mysql_secure_installation
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
查看状态显示
mariadb.service - MariaDB Server
Loaded: loaded (/etc/systemd/system/mariadb.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2021-01-20 19:57:35 CST; 1min 18s ago
Process: 7687 ExecStart=/etc/init.d/mariadb start (code=exited, status=203/EXEC)
1月 20 19:57:35 raspberrypi systemd[1]: Starting MariaDB Server...
1月 20 19:57:35 raspberrypi systemd[7687]: mariadb.service: Failed to execute command: No such file or directory
1月 20 19:57:35 raspberrypi systemd[7687]: mariadb.service: Failed at step EXEC spawning /etc/init.d/mariadb: No such file or directory
1月 20 19:57:35 raspberrypi systemd[1]: mariadb.service: Control process exited, code=exited, status=203/EXEC
1月 20 19:57:35 raspberrypi systemd[1]: mariadb.service: Failed with result 'exit-code'.
1月 20 19:57:35 raspberrypi systemd[1]: Failed to start MariaDB Server.
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