Hi.  This updates podman to 4.3.1.  I haven't done extensive testing,
but the following launches a Trisquel images that appears to work:

echo 'unqualified-search-registries=["docker.io"]' > $HOME/.config/containers/registries.conf
echo '{ "default": [{"type": "insecureAcceptAnything"}] }' > $HOME/.config/containers/policy.json 
#sudo mount -t cgroup2 none /sys/fs/cgroup
echo $USER:10000:65536 | sudo tee /etc/subuid
echo $USER:10000:65536 | sudo tee /etc/subgid
#podman system migrate
podman run -it --rm kpengboy/trisquel:11.0

/Simon