linux mint 19 lamp install

$ sudo apt-get install lamp-server^

$ sudo mysql -u root

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'new-password';
FLUSH PRIVILEGES;
exit;

$ sudo vi /var/www/html/info.php

<?php
 phpinfo(); 
?>

index.phpとphp.infoが正常に表示されるか？

$ sudo service mysql restart

$ sudo apt-get install phpmyadmin