Podman binaries for Linux Mint / Ubuntu are hosted by OpenSuse.org.
You need to add the repository to /etc/source.list.d. Common instructions for Ubuntu might not work, because VERSION_ID for Mint is not the same as for Ubuntu.
Instructions for Linux Mint 20.2 from Ubuntu 20.04 repository:
Example of running container for IoT development:
If you’d like to develop for ESP32 chip connected to /dev/ttyUSB0 using C++ or Rust language, just start the container: