How to enable slow query log for MYSQl in Ubuntu 16.04 ,Nginx

How do I enable slow query log for MYSQL? currently it seem to be disabled.

Thank you.


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There is wrong definition in my.cnf config. Try to add:

slow_query_log = 1
slow_query_log_file = /var/log/mysql/mysql-slow.log
long_query_time = 1

And restart MySQL.