Run this one-liner to install podman on your Ubuntu system:
wget -qO- https://techoverflow.net/scripts/install-podman-ubuntu.sh | sudo bash /dev/stdin
This is the code that is being run, which is exactly the code taken from the Podman installation page.
. /etc/os-release
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/Release.key | sudo apt-key add -
sudo apt-get update
sudo apt-get -y upgrade
sudo apt-get -y install podman