Adding the following line to dav_user.conf before the TypesConfig line fixes the problem.
LoadModule mime_module /usr/lib/apache2/modules/mod_mime.so -- gnome-user-share doesn't start https://launchpad.net/bugs/77479 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
