Installing AWS on Ubuntu And using AWS S3 Client

As @Jan suggested.

1) Use Ubuntu Focal (LTS version - 20.04) providing 5+ years of updates.

2) If you use Xenial (16.04), standard support has already ended, with EOL in 2ish years.

3) Use latest LAMP Stack, today's latest stable versions...

Apache-2.4.48.1
MariaDB-10.5.10
PHP-7.4.20.1
OpenSSL-1.1.1f

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Otherwise... running old Linux + Apache + PHP == Hacker's Paradise.

AWS S3 SDK for PHP will work fine on Ubuntu.  Latest Ubuntu comes with PHP 7.x, is there any reason you need PHP 5.6 ? You can always install a non-default PHP version on Ubuntu. To install PHP 5.6 on Ubuntu, you can use

wget https://raw.githubusercontent.com/serverok/server-setup/master/ubuntu/2-apache-php56-mysql.sh
chmod 755 2-apache-php56-mysql.sh
sudo ./2-apache-php56-mysql.sh

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Thank you all for responding. It's appreciated. So can I just drag and drop my AWS folder from my Windows platform to my new location in Ubuntu ? Same with my entire project ?
I am confused about another item. AS I understand it, Apache must also be installed ?
I checked via terminal window for the installation of Apache and received:

sudo apachectl status apache 

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And received: sudo apachectl command not found..

 sudo apachectl command not found.... 

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I need to install PHP 5.6, curl and all related libraries etc because it matches most of what my clients are using.
And I need to make sure that PHP 5.6 will always be the default version to exceute.

You can install apache with command

sudo apt install apache2

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> And I need to make sure that PHP 5.6 will always be the default version to execute

Following commands will install PHP 5.6

sudo add-apt-repository ppa:ondrej/php
sudo apt -y upgrade
sudo apt -y install php5.6-bcmath php5.6-bz2 php5.6-cgi php5.6-cli php5.6-common php5.6-curl php5.6-dba php5.6-dev php5.6-enchant php5.6-gd php5.6-gmp php5.6-imap php5.6-intl php5.6-json php5.6-mbstring php5.6-mysql php5.6-opcache php5.6-pgsql php5.6-pspell php5.6-readline php5.6-soap php5.6-sqlite3 php5.6-sybase php5.6-tidy php5.6-xml php5.6-xmlrpc php5.6-zip php5.6-xsl php5.6-mcrypt
sudo apt -y install libapache2-mod-php5.6.

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To change the default PHP version for CLI, run

sudo  sudo update-alternatives --config php

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To change apache PHP version, first disable whatever PHP version you are using (find it using phpinfo)

sudo a2dismod php7.x

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To enable PHP 5.6 on apache, run

sudo a2enmod php5.6

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Thank you all for responding. It is appreciated. I can move forward. Newbie to Ubuntu 20 but boy is it ever slick !!
And my client has decided to upgrade to PHP 7 - and am I ever glad too !  :)