Looking deeper into this, on the Focal/Pacific machine:
$ dpkg -l | grep dash ii ceph-mgr-dashboard 15.2.17-0ubuntu0.20.04.4 all dashboard module for ceph-mgr
While compared to Jammy/Quincy:
$ dpkg -l | grep dashboard ii ceph-mgr-dashboard 17.2.5-0ubuntu0.22.04.3 all dashboard module for ceph-mgr
This seems to be a package discrepancy issue, the Pacific packages are available on UCA.
Looking deeper into this, on the Focal/Pacific machine:
$ dpkg -l | grep dash 0ubuntu0. 20.04.4 all dashboard module for ceph-mgr
ii ceph-mgr-dashboard 15.2.17-
While compared to Jammy/Quincy:
$ dpkg -l | grep dashboard 0ubuntu0. 22.04.3 all dashboard module for ceph-mgr
ii ceph-mgr-dashboard 17.2.5-
This seems to be a package discrepancy issue, the Pacific packages are available on UCA.