February 26
Edit

Upgrade Ubuntu 16.04 to Ubuntu 18.04 LTS

Note: you should stop apache before upgrade. You should back up your conf files, such as apache2.conf, php.ini, my.ini, and all VirtualHost settings.

Run simple command to upgrade. 

sudo do-release-upgrade

After server restarted, login and STOP apache2 to prevent PHP short end breaks php rendering.

Enable new php short hand tag in php.ini if it is needed for your code.

sudo apt-get remove php7.2-common

sudo apt autoremove

sudo apt-get install -y php-pdo-mysql

sudo apt install php7.2-mysql php7.2-curl php7.2-gd php7.2-json php7.2-mbstring php7.2-opcache php7.2-tidy php7.2-xml php7.2-xmlrpc php7.2-zip php7.2-bcmath libapache2-mod-php

sudo apt-get install -y php7.2-bz2 php7.2-soap php7.2-dba

sudo a2enmod php7.2

you should see /etc/php/7.2 folder. if 7.0 old folder exists, delete it. 

If you need php pdo for mysql and other common php modules

sudo service apache2 restart

NOTE: upgrade to ubuntu 18.04 which comes with mysql 5.7. To solve no default value issue, use following settign in my.ini

[mysqld]
sql-mode=""
# Or
# sql-mode="NO_ENGINE_SUBSTITUTION"

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