dashboard module missing dependencies in 15.2.1 Octopus

[Duncan Bellamy <a.16bit.sysop@xxxxxx>]

Hi,
I have installed ceph on Ubuntu Focal Fossa using the ubuntu repo, instead of ceph-deploy (as ceph-deploy install does not work for Focal Fossa yet)  install I used:
sudo apt-get install -y ceph ceph-mds radosgw ceph-mgr-dashboard

The rest of the setup was the same as the quickstart on ceph.io <http://ceph.io/> with ceph-deploy.

It installed ceph version 15.2.1 (octopus).

If I do a 'ceph -s' I get the warning:
health: HEALTH_WARN
            2 mgr modules have failed dependencies

If I run 'ceph mgr module ls', for enabled and active modules I get:

 "always_on_modules": [
        "balancer",
        "crash",
        "devicehealth",
        "orchestrator",
        "osd_support",
        "pg_autoscaler",
        "progress",
        "rbd_support",
        "status",
        "telemetry",
        "volumes"
    ],
    "enabled_modules": [
        "iostat",
        "restful” 

Then when I run 'ceph mgr module enable dashboard’ I get the error:

Error ENOENT: module 'dashboard' reports that it cannot run on the active manager daemon: No module named 'yaml' (pass --force to force enablement)

I have tried searching, and searching with apt but cannot find any ‘yaml’ package that might be used by ceph.

Duncan
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