How to install PHP 7.2 and V8Js on Ubuntu

INSTALLV8JS.md

apt update
apt upgrade
apt-get install python-software-properties
add-apt-repository -y ppa:ondrej/php 
add-apt-repository -y ppa:pinepain/libv8-archived
apt update
apt-get install php7.2 php7.2-curl php7.2-dev php7.2-mbstring php7.2-zip php7.2-mysql libv8-dev
pecl install v8js
echo 'extension=v8js.so' >> /etc/php/7.2/cli/conf.d/20-v8js.ini 
php -i | grep v8js

// confirmed with Ubuntu 16 and 17

@dmedeletncsa

this kind of warning I am having after trying two times executing your code

PHP Warning:  PHP Startup: Unable to load dynamic library 'v8js.so' (tried: /usr/lib/php/20170718/v8js.so (/usr/lib/php/20170718/v8js.so: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/v8js.so.so (/usr/lib/php/20170718/v8js.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'v8js.so' (tried: /usr/lib/php/20170718/v8js.so (/usr/lib/php/20170718/v8js.so: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/v8js.so.so (/usr/lib/php/20170718/v8js.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP 7.2.19-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: May 31 2019 11:16:55) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.19-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies

It looks like pinepain/libv8-archived no longer includes libv8-dev

@joehoyle its complex to configure and v8js. I tried many many times but did not happen yet.

The repository 'http://ppa.launchpad.net/pinepain/libv8-archived/ubuntu bionic Release' does nothave a Release file.

Worth pointing out that libv8-dev is outdated now. You will need to compile a newer version of v8 in your system. See this: https://github.com/phpv8/v8js/blob/php7/README.Linux.md

Hope this helps someone