distupgrade: ModuleNotFoundError: No module named 'systemd._daemon'

While running a dist upgrade plinth errored out with:

vagrant@freedombox:/freedombox$ freedombox-develop 
Traceback (most recent call last):
  File "/freedombox/run", line 6, in <module>
    import plinth.__main__
  File "/freedombox/plinth/__main__.py", line 9, in <module>
    import systemd.daemon
  File "/usr/lib/python3/dist-packages/systemd/daemon.py", line 3, in <module>
    from ._daemon import (__version__,
    ...<10 lines>...
                          LISTEN_FDS_START)
ModuleNotFoundError: No module named 'systemd._daemon'
vagrant@freedombox:/freedombox$