Hey gang - here's how you can easily install Postgres 13 on your shiny new Linux Mint 20 computer.

Add the deb url to your sources list

sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ focal-pgdg main" > \      
/etc/apt/sources.list.d/postgresql.list'

Add postgres' official key

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -

Update and upgrade apt

sudo apt update
sudo apt upgrade

Install postgresql-13

sudo apt-get install postgresql-13 postgresql-client-13

Run the postgres 13 service

sudo systemctl status postgresql

Verify you have everything installed

psql --version                                                              
psql (PostgreSQL) 13.5 (Ubuntu 13.5-1.pgdg20.04+1)

You're done!