vi /etc/apt/sources.list.d/pgdg.list
add...
deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main
Import the repository signing key, and update the package listsÂ
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
Install...
apt-get install postgresql-12
Startup...
pg_ctlcluster 12 main start
Set a password...
sudo su - postgres
psql postgres
\password postgres
sudo amazon-linux-extras enable postgresql11
sudo yum clean metadata
sudo yum install postgresql