Notebook images have moved to quay.io
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JupyerHub project maintains many standard notebook images - https://jupyter-docker-stacks.readthedocs.io/en/latest/using/selecting.html . These images used to be on Docker Hub. Recently, they have moved to quay.io . If you were using custom images, please note that the images on Docker Hub or updated anymore.
The package itself is now fixed to follow quay images.