Public bug reported:

The default configuration file for MySQL has a few wrongly named
variables, i.e. system variables whose name has changed over versions.

In the file /etc/mysql/mysql.conf.d/mysqld.cnf there are the following
lines:

#table_cache            = 64
#log_slow_queries = /var/log/mysql/mysql-slow.log
#log-queries-not-using-indexes

The current version of MySQL in use requires these to be named:

table_open_cache
slow_query_log_file
log_queries_not_using_indexes

Although they are commented out, the variables names should be revised
to work with the version they accompany.  Uncommenting them and/or
changing their values will result in mysqld crashing.

** Affects: mysql-5.7 (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- mysql-server all 5.7.12 wrong variables in mysqld.cnf
+ mysql-server 5.7.12 wrong variables in mysqld.cnf

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https://bugs.launchpad.net/bugs/1592729

Title:
  mysql-server 5.7.12 wrong variables in mysqld.cnf

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