ERROR 1558 (HY000): Column count of mysql.user is wrong. Expected 43, found 42. Created with MySQL 5
【解决办法】：
错误是因为升级过数据库，升级之后没更新数据库里的结构信息导致的。
mysql_upgrade -u root -p
https://blog.csdn.net/qq_36819098/article/details/78169922
原文：https://www.cnblogs.com/tomtellyou/p/11799927.html