PostgreSQL and phpPgAdmin on Ubuntu 20.04
My test platform: Ubuntu Server 20.04
Requirements: user with root privileges or non-root user with sudo privileges.
PostgreSQL and phpPgAdmin installation
$ sudo apt update; sudo apt upgrade -y
$ sudo apt install postgresql postgresql-contrib phppgadmin -y
$ systemctl start postgresql.service
$ systemctl enable postgresql.service
$ systemctl status postgresql.service