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

Hi, I followed this instructions but encountered the following error. Could u please let me know what might be the cause of this .

try
sudo bash -c 'echo ''extension=v8js.so'' >> /etc/php/7.2/cli/conf.d/20-v8js.ini'

not sure the syntax is correct

The repository 'http://ppa.launchpad.net/pinepain/libv8-archived/ubuntu bionic Release' does not have a Release file

When I run apt-get install python-software-properties I get the following error

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-software-properties is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  software-properties-common

E: Package 'python-software-properties' has no installation candidate

Installation confirmed again on Ubuntu 16.

@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