PHP 7.2 ubuntu 16.xx

# php -v
# apt-get remove php7.0
# apt-get purge php7.0-common
# apt-get remove --auto-remove php7.0
# apt-get update && apt-get upgrade
# apt-get install software-properties-common
# add-apt-repository ppa:ondrej/php
# apt-get update
# apt-get install php7.2
# php -v
# apt-get install php-pear php7.2-curl php7.2-dev php7.2-gd php7.2-mbstring php7.2-zip php7.2-mysql php7.2-xml
# systemctl restart apache2

# sudo apt-get install mysql-server
# mysql_secure_installation

# apt-get install phpmyadmin php-mbstring php-gettext
# phpenmod mcrypt
# phpenmod mbstring
# systemctl restart apache2

# apt-get install mariadb-server
# mysql -u root -p
 > USE mysql
 > UPDATE user SET plugin='mysql_native_password' WHERE User='root';
 > FLUSH PRIVILEGES;
 > SET PASSWORD FOR 'root'@'localhost' = PASSWORD('New-Password');
 > quit

if database connection error http://avistudcorp.blogspot.com/2017/02/mengatasi-connection-for-controluser-as.html

if error 404 permalink module do :
- edit .htaccess (module ON)
- a2enmod rewrite && service apache2 restart