我刚刚从 Debian 8 升级到 9。
显然，它破坏了与数据库相关的所有内容。我现在无法启动 MySQL，错误是：
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")
服务状态：
systemctl status mariadb.service
显示错误：
? mariadb.service - MariaDB database server
Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2018-02-02 16:55:27 AEST; 35s ago
Process: 6859 ExecStartPost=/etc/mysql/debian-start (code=exited, status=203/EXEC)
Process: 6832 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=0/SUCCESS)
Process: 6821 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= || VAR=`/usr/bin/galera_recovery`; …