No Debian packages
https://docs.ceph.com/docs/master/start/os-recommendations/ states there should be nautilus packages available for debian including:
B: We build release packages for this platform. For some of these platforms, we may also continuously build all ceph branches and exercise basic unit tests.
I: We do basic installation and functionality tests of releases on this platform.
None are available at: https://download.ceph.com/debian-nautilus/pool/main/c/ceph/
only ceph-deploy, which fails