Package: ceph-mgr Version: 18.2.7+ds-1+deb13u1 I installed the `ceph` meta-package on a Debian 13 server, and then attempted to perform a manual installation of Ceph as described on <https://docs.ceph.com/en/reef/install/index_manual/#install-manual>. ceph-mgr failed to load modules, showing a "MGR_MODULE_DEPENDENCY: 13 mgr modules have failed dependencies" message in `ceph health detail`. Logs for ceph-mgr show the below:
Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: 2026-07-11T16:06:03.673+0000 7f7167a480c0 -1 mgr[py] Class not found in module 'iostat' Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: 2026-07-11T16:06:03.673+0000 7f7167a480c0 -1 mgr[py] Error loading module 'iostat': (22) Invalid argument Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: 2026-07-11T16:06:03.737+0000 7f7167a480c0 -1 mgr[py] Module not found: 'mgr_module' Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: 2026-07-11T16:06:03.737+0000 7f7167a480c0 -1 mgr[py] Traceback (most recent call last): Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: File "/usr/share/ceph/mgr/mgr_module.py", line 29, in <module> Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: from mgr_util import profile_method Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: File "/usr/share/ceph/mgr/mgr_util.py", line 6, in <module> Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: import bcrypt Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: File "/lib/python3/dist-packages/bcrypt/__init__.py", line 13, in <module> Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: from ._bcrypt import ( Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: ...<11 lines>... Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: ) Jul 11 16:06:03 dp-1191 ceph-mgr[37463]: ImportError: PyO3 modules do not yet support subinterpreters, see https://github.com/PyO3/pyo3/issues/576 I am on Debian 13.5 and the installed Python version is 3.13.5.
