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Accepted Answer
@avinashhrms I’m pretty sure you’re seeing this error because you’re actually downgrading database.
I would highly recommend you setup 16.04 for WordPress, since it comes with a much newer Nginx, PHP and MySQL, which is also twice as fast.
So either use a newer setup (with MySQL 5.5.3+), or edit your backup_db.sql and do a search/replace of utf8mb4 to utf8
If you export the data via phpMyAdmin, you can change the compatibility mode to MySQL4. That would also solve it.