Please, share error messages as formatted texts instead of pictures, as we can refer to texts more easily.
Based on the picture it looks like you are in the rootless context and the rootless docker is not running. If you check the error messages you can see that the socket mentioned in the systemd log is not the same as in the error message.
List the docker contexts
docker context ls
and switch to the correct context which is probably “default”
docker context use default
Also make sure you install only one Docker. Ubuntu supports multiple variants of Docker. Do not use “snap” and if you install Docker Desktop, you probably don’t want to use Docker CE. If you want to use Docker CE, don’t install Docker Desktop unless you are sure you need both and you know how they work together.