Public bug reported: I am on a stock Ubuntu 14.04 machine (a Digital Ocean virtual server). When I run "mailman start" I get this traceback: $ mailman start Starting Mailman's master runner Traceback (most recent call last): File "/usr/local/bin/mailman", line 9, in <module> load_entry_point('mailman==3.0.0b6', 'console_scripts', 'mailman')() File "/usr/local/lib/python3.4/dist-packages/mailman-3.0.0b6-py3.4.egg/mailman/bin/mailman.py", line 100, in main args.func(args) File "/usr/local/lib/python3.4/dist-packages/mailman-3.0.0b6-py3.4.egg/mailman/commands/cli_control.py", line 138, in process os.execl(*execl_args) File "/usr/lib/python3.4/os.py", line 489, in execl execv(file, args) TypeError: Can't convert 'NoneType' object to str implicitly For reference, my .bash_history (removing the bits where I, e.g., used aptitude to check that I wanted python3-setuptools, and annotating where I got errors): sudo apt-get update sudo apt-get install bzr python-setuptools python-dev build-essential postfix mkdir repos cd repos/ bzr branch lp:mailman bzr branch lp:mailman.client bzr branch lp:postorius bzr branch lp:~mailman-coders/postorius/postorius_standalone cd mailman python setup.py install # got error - it wants Python 3 python3 setup.py install # got ImportError: No module named 'setuptools' sudo apt-get install python3-setuptools sudo python3 setup.py install sudo mailman start (And if I made an error in installing here, please let me know and I'll fix the docs.) ** Affects: mailman Importance: Undecided Status: New ** Tags: mailman3 -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1411435 Title: installing: TypeError: Can't convert 'NoneType' object to str implicitly To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1411435/+subscriptions