Docker: unknown server OS: .

[Folix0]

I ran into a docker issue when running this part of the code:
Now, create an alias which will be used to run the Docker container. This normally goes in your ~/.zshrc or ~/.bashrc:

Any idea on how to fix this? Konsole screenshot below.

EDIT: after playing around with docker user groups, I was able to execute the above code. Following this guide until step 4.: https://docs.docker.com/engine/install/linux-postinstall/ and then running the script again