Comment 3 for bug 1002510

Same here. Upgrade failed on xenial.

Well, to fix the problem, I've created the expected file manually and run apt-get install -f. Once done, I've purged the package and reinstalled it. Then installation failed because the service authdaemon could not start. This is due to the new systemd /usr/lib/tmpfiles.d/courier-authdaemon.conf configuration file which attemps to create run directory with wrong user (courier) instead of the daemon user.