Have you previously installed UCP on your system? You can check this by running docker ps and seeing if any containers which start with “ucp” show up onthe system. If you have previously installed UCP, you can use the same install listed above command but add --fresh-install at the beginning to wipe the system clean and put in a new UCP install.
You may also want to remove any extra volumes on the system in case they were left over from the old install. You could do this with “docker volume rm $(docker volume ls -q)” Bear in mind this could remove other volumes on that machine as well.
You can definitely install UCP on a local machine. You will need a Linux OS running on the machine, or you will need some software that can create Linux VMs for you locally (e.g. VMware Fusion, VirtualBox, etc.). Officially UCP supports RHEL, CentOS, and Ubuntu as shown in the quickstart guide.