What to do with the following message? My portainer (container) is running on a virtual Ubuntu machine on my FreeNas server with the name docker. Before upgrading portainer on the virtual machine. I will take a snapshot with the FreeNas filing system. This way I can rollback in case it is needed. Opening ssh session. I will do this with putty my ssh client of choice. "sudo -i" to stay in a root session. List the containers. "docker container ls" Stop the container portainer. "docker stop portainer" Pull the latest image of portainer. "docker pull portainer/portainer-ce" Remove docker portainer. "docker rm portainer" Start the new portainer container. "docker run -d -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce" The only thing to do is to delete the old image of the old portainer. "docker image ls" "docker image rm ...