Problems installing with synaptic under jaunty

[André Barmasse]

Binary package hint: calendarserver

Installation of the calendardserver 1.2.dfsg-8 with Synaptic under Jaunty is not possible.
The following error is displayed:

E: /var/cache/apt/archives/python-twisted-calendarserver_0.2.0.svn19773-5ubuntu1_i386.deb: Versuche, »/usr/share/pyshared/twisted/plugins/__init__.py« zu überschreiben, welches auch in Paket python-twisted-core ist

[Jose de Jesus Pascacio Castillejos (heavenly6mx)]

E: /var/cache/apt/archives/python-twisted-calendarserver_0.2.0.svn19773-5ubuntu1_i386.deb: intentando sobreescribir `/usr/share/pyshared/twisted/plugins/__init__.py', que está también en el paquete python-twisted-core

[Tomas Cassidy (tomas-cassidy)]

I can confirm this bug exists on Ubuntu 9.04. python-twisted-calendarserver won't install because apt/dpkg complains that the file '/usr/share/pyshared/twisted/plugins/__init__.py' already exists in the dependency package python-twisted-core and exits with an error when it attempts to copy a file from python-twisted-calendarserver to the same location as the file installed from python-twisted-core.

[Zooko Wilcox-O'Hearn (zooko)]

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.