16.04 500 Internal sever error

[Paul Weston]

I encountered this error after I upgraded to the latest maas alpha. I decided to do a fresh install after some unsuccessful troubleshooting. I still encounter this error on a fresh install.

2016-04-05 03:28:53 [HTTPChannel,19,{Correct IP}] 500 Error - /MAAS/accounts/login/
 Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/django/core/handlers/wsgi.py", line 189, in __call__
     response = self.get_response(request)
   File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 227, in get_response
     response = get_response(request)
   File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 201, in get_response
     return django_get_response(request)
   File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 218, in get_response
     response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
 --- <exception caught here> ---
   File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 164, in get_response
     response = response.render()
   File "/usr/lib/python3/dist-packages/django/template/response.py", line 158, in render
     self.content = self.rendered_content
   File "/usr/lib/python3/dist-packages/django/template/response.py", line 135, in rendered_content
     content = template.render(context, self._request)
   File "/usr/lib/python3/dist-packages/django/template/backends/django.py", line 74, in render
     return self.template.render(context)
   File "/usr/lib/python3/dist-packages/django/template/base.py", line 209, in render
     with context.bind_template(self):
   File "/usr/lib/python3.5/contextlib.py", line 59, in __enter__
     return next(self.gen)
   File "/usr/lib/python3/dist-packages/django/template/context.py", line 241, in bind_template
     updates.update(processor(self.request))
   File "/usr/lib/python3/dist-packages/maasserver/context_processors.py", line 27, in global_options
     version = get_maas_version_ui()
   File "/usr/lib/python3/dist-packages/maasserver/utils/version.py", line 87, in wrapped
     _cache[key] = fun(*args, **kwargs)
   File "/usr/lib/python3/dist-packages/maasserver/utils/version.py", line 123, in get_maas_version_ui
     version, subversion = get_maas_version_subversion()
   File "/usr/lib/python3/dist-packages/maasserver/utils/version.py", line 87, in wrapped
     _cache[key] = fun(*args, **kwargs)
   File "/usr/lib/python3/dist-packages/maasserver/utils/version.py", line 108, in get_maas_version_subversion
     branch_version = get_maas_branch_version()
   File "/usr/lib/python3/dist-packages/maasserver/utils/version.py", line 62, in get_maas_branch_version
     revno = shell.call_and_check(("bzr", "revno", __file__))
   File "/usr/lib/python3/dist-packages/provisioningserver/utils/shell.py", line 125, in call_and_check
     process = Popen(command, *args, stdout=PIPE, stderr=PIPE, **kwargs)
   File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
     restore_signals, start_new_session)
   File "/usr/lib/python3.5/subprocess.py", line 1541, in _execute_child
     raise child_exception_type(errno_num, err_msg)
 builtins.FileNotFoundError: [Errno 2] No such file or directory: 'bzr'

Package List:

||/ Name Version Architecture Description
+++-===============================-=============================-============-=================================================
ii maas 2.0.0~alpha4+bzr4843-0ubuntu1 all "Metal as a Service" is a physical cloud and IPAM
ii maas-cli 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS client and command-line interface
un maas-cluster-controller <none> <none> (no description available)
ii maas-common 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS server common files
ii maas-dhcp 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS DHCP server
ii maas-dns 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS DNS server
ii maas-proxy 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS Caching Proxy
ii maas-rack-controller 2.0.0~alpha4+bzr4843-0ubuntu1 all Rack Controller for MAAS
ii maas-region-api 2.0.0~alpha4+bzr4843-0ubuntu1 all Region controller API service for MAAS
ii maas-region-controller 2.0.0~alpha4+bzr4843-0ubuntu1 all Region Controller for MAAS
un maas-region-controller-min <none> <none> (no description available)
un python-django-maas <none> <none> (no description available)
un python-maas-client <none> <none> (no description available)
un python-maas-provisioningserver <none> <none> (no description available)
ii python3-django-maas 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS server Django web framework (Python 3)
ii python3-maas-client 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS python API client (Python 3)
ii python3-maas-provisioningserver 2.0.0~alpha4+bzr4843-0ubuntu1 all MAAS server provisioning libraries (Python 3)