The docker command line is order sensitive. The order of args goes:
docker ${args_to_docker} run ${args_to_run} image_ref ${cmd_in_container}
Everything after ubuntu
in your command goes to the command trying to be run. In your case -it
. What you want instead is to pass -it
to "run" so that you get interactive input with a tty terminal associated.
docker run -it ubuntu /bin/bash
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