Ubuntu in Docker Container

I downloaded the Ubuntu image in the docker container and I’ve looked up a couple of documentation and most of it, provides

Docker - it provides a simple pull command but that can’t be the only step to install ubuntu in my docker? I’ve tried working on it with SSH but get a permission denied error, not sure what to do.

I’ve also referenced this https://www.makeuseof.com/run-ubuntu-as-docker-container/) and How To Install and Use Docker on Ubuntu 20.04 | DigitalOcean

Not sure where to look-any suggestions would be greatly appreciated.

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