I am facing this when i go to localhost
**Your PHP installation appears to be missing the MySQL extension which is required by WordPress.
Please check that the mysqli PHP extension is installed and enabled.
If you are unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress support forums.**
I have followed and each and every step from here : https://ubuntu.com/tutorials/install-and-configure-wordpress
Kindly tell me the appropriate solution i could not find any