Install X2Go as Remote Dekstop on Debian 10

Requirements to install X2Go is VPS with high memory min 6GB
Install and configure the Full Desktop Environment. This is similar to what you would get if you installed Debian from a bootable DVD/USB memory stick to your local PC:

#apt-get update && apt-get upgrade -y

Step 1: Installing the Desktop Environment

#apt-get install task-xfce-desktop -y

Install xfce4 and all of the additional dependencies needed to support it:

#apt-get install xfce4

Step 2: Install X2Go on your server, type the following command:

#apt-get install x2goserver x2goserver-xsession

Step 3: Installing the X2Go Client Locally
On Linux

#apt-get install x2goclient

On Windows download X2Go Client at https://wiki.x2go.org/doku.php/download:start

Step 4: Connecting To the Remote Desktop
In the top-left menu select New session
Enter your server’s IP address or hostname in the Host field under Server.
Enter the username you used for your SSH connection in the Login field.
And, since you installed XFCE in Step Two, choose XFCE as your Session

Source https://www.digitalocean.com/community/tutorials/how-to-set-up-a-remote-desktop-with-x2go-on-debian-10

Install Composer and phpmailer

To quickly install Composer in the current directory, run the following script in your terminal. To automate the installation, use the guide on installing Composer programmatically.

#cd /var/www/html
#php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
#php -r "if (hash_file('sha384', 'composer-setup.php') === 'edb40769019ccf227279e3bdd1f5b2e9950eb000c3233ee85148944e555d97be3ea4f40c3c2fe73b22f875385f6a5155') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
#php composer-setup.php
#php -r "unlink('composer-setup.php');"

Most likely, you want to put the composer.phar into a directory on your PATH, so you can simply call composer from any directory (Global install)

#sudo mv composer.phar /usr/local/bin/composer

Install PHPMAILER

#composer require phpmailer/phpmailer