Source: How to Install Docker on Linux Mint 21: A Step-by-Step Guide
I found this guide to be concise and accurate as of July 2025 with a up to date LMDE 6.
Basically the commands are:
sudo apt install apt-transport-https ca-certificates curl gnupgcurl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg –dearmor -o /usr/share/keyrings/docker.gpgecho “deb [arch=$(dpkg –print-architecture) […]