echo user.max_user_namespaces=15076 | sudo tee -a /etc/sysctl.conf
echo 'vit:100000:65536' | sudo tree -a /etc/subuid
echo 'vit:100000:65536' | sudo tee -a /etc/subgid
sudo reboot

sudo podman images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/library/ubuntu latest 1e4467b07108 2 weeks ago 76.3 MB