mysqldump: Got error: 1044: Access denied for user ‘root’@’localhost’ to database ‘information_schema’ when using LOCK TABLES

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​How do I fix this problem?

You can pass the --single-transaction option to mysqldump command:
$ mysqldump --single-transaction -u user -p DBNAME > backup.sql
Another option is to grant LOCK TABLES to your user:
$ mysql -u root -p
And type:
mysql> GRANT SELECT,LOCK TABLES ON DBNAME.* TO 'username'@'localhost'; ​

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