出现问题:

Column count of mysql.user is wrong. Expected 43, found 42. Created with MySQL 50518, now running 50641. Please use mysql_upgrade to fix this error.

解决方法:

In my case, and following the recommendation of the error message, I ran:

root@mysql--gm3j4:/# mysql_upgrade -uroot -p***
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.user OK
Upgrading the sys schema.
Checking databases.
[...]
Upgrade process completed successfully.
Checking if update is needed.
That solved everything.

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