Hi @caronc,
Thanks for opening this thread and sorry for the hassle.
Could you please also share a link to one of the builds that were failing before including the virtualenv approach you mention, so that we can check the original error as well?
In the meantime, I noticed at Issues with dbus that someone suggested installing dbus directly with pip. Is this something you tried already?
pip install dbus-python
Looking forward to hearing back from you!