Installing the lapp stack on Ubuntu 20

https://kb.amijani.net/web-server/how-to-install-lapp-apache-php-postgresql-on-ubuntu-20-04/

Basically, 
sudo apt install apache2
sudo apt install php7.4 libapache2-mod-php7.4 openssl php-imagick php7.4-common php7.4-curl php7.4-gd php7.4-imap php7.4-intl php7.4-json php7.4-ldap php7.4-mbstring php7.4-pgsql php-ssh2 php7.4-xml php7.4-zip unzip

Then install PostgreSQL with
https://www.digitalocean.com/community/tutorials/how-to-install-postgresql-on-ubuntu-20-04-quickstart