Laravel 5.5 php artisan migrate error in Ubuntu: SQLSTATE[HY000] [2002] Connection refused

How I got this error?
Ans: I was running php artisan migrate command in /opt/lampp/htdocs/project_dir

What was the error?
ubuntu@ip-ip_addr:/opt/lampp/htdocs/project_dir$ php artisan migrate
In Connection.php line 664:

SQLSTATE[HY000] [2002] Connection refused (SQL: select * from information_schema.tables where table_schema = db_name and table_name = migrations

In Connector.php line 67:

SQLSTATE[HY000] [2002] Connection refused

Screenshot of the error:

1. Open .env file
2. Change the DB_HOST= to DB_HOST=localhost
3. Make sure the port number, db name, username and password is correctly mention in the .env before saving it
4. Save the .env file then run command: sudo artisan config:cache
5. Now, run command: php artisan migrate

Output after applying the solution:

Thanks for reading. I hope you enjoyed the article!