install postgress

# postgres13 installation ubuntu 20.04

sudo apt-get remove postgresql-client
sudo apt autoremove
sudo apt update
sudo apt install curl gpg gnupg2 software-properties-common apt-transport-https lsb-release ca-certificates
curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/postgresql.gpg
echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" |sudo tee /etc/apt/sources.list.d/pgdg.list
cat /etc/apt/sources.list.d/pgdg.list
sudo apt-get update
sudo apt install postgresql-client-13
psql --version
pg_dump --version