[Maria-discuss] auth_socket.so on upgrade 5.7 -> 10.2

Hello, Is mysql_upgrade meant to facilitate a migration from auth_socket.so to MariaDB’s unix_socket.so? I just tried to upgrade 5.7 to 10.2 and found root@localhost (which was set up to use MySQL auth_socket.so) was no longer able to connect because “ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded”. -FG