Install Postgresql (Ubuntu 20.04)sudo apt install postgresql postgresql-contribsudo systemctl enable postgresql.service Initial PostgreSQL Setup (Ubuntu 20.04)I change the access control porton of the /etc/postgresql/12/main/pg_hba.conf to the following:# Database administrative login by Unix domain socketlocal all postgres peer# TYPE DATABASE USER ADDRESS METHOD# "local" is for Unix domain socket connections only#local all all peer# IPv4 local connections:#host all all 127.0.0.1/32 md5# IPv...