Install Postgres 12 on Ubuntu 20.04 from scratch

gistfile1.txt

apt update

apt-get install postgresql-12

update /etc/postgresql/12/main/postgresql.conf: "listen_addresses = '*'"
update /etc/postgresql/12/main/pg_hba.conf: "host all all 0.0.0.0/0 md5"

service postgresql restart

su - postgres

psql

ALTER ROLE postgres WITH PASSWORD 'letmein';