This seems to be related to #410098 -- twisted installs a directory named "plugins" but it isn't a Python package, it is just a directory. Some other tools seem to create an __init__.py file and put it into this directory sometimes, and that seems to cause a problem. Or maybe I got it all backwards. Anyway, something is messed up with regard to files named "twisted/plugins/__init__.py" in Debian and Ubuntu.
This seems to be related to #410098 -- twisted installs a directory named "plugins" but it isn't a Python package, it is just a directory. Some other tools seem to create an __init__.py file and put it into this directory sometimes, and that seems to cause a problem. Or maybe I got it all backwards. Anyway, something is messed up with regard to files named "twisted/ plugins/ __init_ _.py" in Debian and Ubuntu.