Trying to get phpmyadmin running on Ubuntu MATE on the Raspberry Pi

I am getting the error…

phpMyAdmin - Error

The mysqli|mysql extension is missing. Please check your PHP configuration. See our documentation for more information.

I have installed…

But nothing seems to work, stuck!

I'd suggest installing the full LAMP stack, which should fill in any missing packages for a complete web server on the Raspberry Pi.

sudo apt install tasksel
sudo tasksel

Scroll down and check LAMP server, followed by tab and enter: