Hi, Unfortunately I'm not very fond of Python. Calendarserver is the only contact with Python I had so far. On my server I just upgraded from Ubuntu 12.04 to 14.04. That upgraded my calendarserver from 2.4.dfsg-7 to 5.2+dfsg-1. But now it won't start anymore, failing in the below error. Has anyone a hint on what I could try to eliminate this problem? Best regards, Axel Traceback (most recent call last): File "/usr/bin/twistd", line 14, in <module> run() File "/usr/lib/python2.7/dist-packages/twisted/scripts/twistd.py", line 27, in run app.run(runApp, ServerOptions) File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 637, in run config.parseOptions() File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 604, in parseOptions usage.Options.parseOptions(self, options) File "/usr/lib/python2.7/dist-packages/twisted/python/usage.py", line 261, in parseOptions for (cmd, short, parser, doc) in self.subCommands: File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 621, in subCommands for plug in sorted(plugins, key=attrgetter('tapname')): File "/usr/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 31, in getProperty return getattr(reflect.namedClass(self.serviceMakerClass), propname) File "/usr/lib/python2.7/dist-packages/twisted/python/_reflectpy3.py", line 151, in namedObject module = namedModule('.'.join(classSplit[:-1])) File "/usr/lib/python2.7/dist-packages/twisted/python/_reflectpy3.py", line 137, in namedModule topLevel = __import__(name) File "/usr/lib/python2.7/dist-packages/calendarserver/tap/caldav.py", line 77, in <module> from txdav.common.datastore.upgrade.migrate import UpgradeToDatabaseStep File "/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/migrate.py", line 44, in <module> from txdav.common.datastore.file import CommonDataStore as FileStore, TOPPATHS File "/usr/lib/python2.7/dist-packages/txdav/common/datastore/file.py", line 37, in <module> from twistedcaldav.notifications import NotificationRecord File "/usr/lib/python2.7/dist-packages/twistedcaldav/notifications.py", line 33, in <module> from twistedcaldav.resource import ReadOnlyNoCopyResourceMixIn, CalDAVResource File "/usr/lib/python2.7/dist-packages/twistedcaldav/resource.py", line 71, in <module> from twistedcaldav.directory.internal import InternalDirectoryRecord File "/usr/lib/python2.7/dist-packages/twistedcaldav/directory/internal.py", line 30, in <module> from twistedcaldav.directory.directory import DirectoryService, DirectoryRecord File "/usr/lib/python2.7/dist-packages/twistedcaldav/directory/directory.py", line 51, in <module> from txdav.caldav.datastore.scheduling.ischedule.localservers import Servers File "/usr/lib/python2.7/dist-packages/txdav/caldav/datastore/scheduling/ischedule/localservers.py", line 23, in <module> from txdav.caldav.datastore.scheduling.ischedule.utils import getIPsFromHost File "/usr/lib/python2.7/dist-packages/txdav/caldav/datastore/scheduling/ischedule/utils.py", line 20, in <module> from twisted.names import dns ImportError: No module named names