Event scheduler damaged

El error

mysql> set global event_scheduler = 1;
ERROR 1577 (HY000): Cannot proceed because system tables used by Event Scheduler were found damaged at server start
mysql> exit

Actualizamos el mysql

debian# mysql_upgrade -u root -h localhost -p --verbose --force

Luego de unos mensajes
.
.
syslog.ui_layout OK
syslog.users OK
Running 'mysql_fix_privilege_tables'...
OK
debian#

debian# /etc/init.d/mysql stop
debian# /etc/init.d/mysql start

mysql> set global event_scheduler = 1;
Query OK, 0 rows affected (0.01 sec)

mysql> select @@event_scheduler;
+-------------------+
| @@event_scheduler |
+-------------------+
| ON |
+-------------------+
1 row in set (0.00 sec)

mysql>

Listo