Which Linux distro is best for deep learning?

Ubuntu has official support for KubeFlow, Kubernetes, Docker, CUDA, etc., and hence Ubuntu satisfies all our needs mentioned above. Being a popular distro you can find a wealth of information online like support, machine learning tutorials etc. And hence Ubuntu is chosen as the number 1 distro for machine learning!

Is Ubuntu good for deep learning?

Yes, Linux machines are better for machine learning. It is better for software development in general and you can find many flame wars on this. Ubuntu comes with better package management so it easier to install the common stuff.