Comment 0 for bug 1758882

when installing gnocchi, ceilometer and neutron on the same node.

root@unassigned:~# neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade heads
Traceback (most recent call last):
  File "/usr/bin/neutron-db-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 652, in main
    return_val |= bool(CONF.command.func(config, CONF.command.name))
  File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 171, in do_upgrade
    run_sanity_checks(config, revision)
  File "/usr/lib/python2.7/dist-packages/neutron/db/migration/cli.py", line 636, in run_sanity_checks
    script_dir.run_env()
  File "/usr/lib/python2.7/dist-packages/alembic/script/base.py", line 425, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.7/dist-packages/alembic/util/pyfiles.py", line 93, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/lib/python2.7/dist-packages/alembic/util/compat.py", line 75, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/usr/lib/python2.7/dist-packages/neutron/db/migration/alembic_migrations/env.py", line 24, in <module>
    from neutron.db.migration.models import head # noqa
  File "/usr/lib/python2.7/dist-packages/neutron/db/migration/models/head.py", line 29, in <module>
    from neutron.db import agentschedulers_db # noqa
  File "/usr/lib/python2.7/dist-packages/neutron/db/agentschedulers_db.py", line 32, in <module>
    from neutron.db import agents_db
  File "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 45, in <module>
    from neutron.extensions import agent as ext_agent
  File "/usr/lib/python2.7/dist-packages/neutron/extensions/agent.py", line 25, in <module>
    from neutron.api.v2 import base
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 37, in <module>
    from neutron import quota
  File "/usr/lib/python2.7/dist-packages/neutron/quota/__init__.py", line 30, in <module>
    from neutron.db.quota import api as quota_api
  File "/usr/lib/python2.7/dist-packages/neutron/db/quota/api.py", line 110, in <module>
    def set_quota_usage_dirty(context, resource, tenant_id, dirty=True):
  File "/usr/lib/python2.7/dist-packages/neutron/db/api.py", line 146, in decorator
    ctx_arg_index = p_util.getargspec(f).args.index(context_var_name)
  File "/usr/lib/python2.7/dist-packages/pecan/util.py", line 44, in getargspec
    reverse=True
  File "/usr/lib/python2.7/dist-packages/pecan/util.py", line 43, in <lambda>
    key=lambda c: 'self' in c.cell_contents.__code__.co_varnames,
AttributeError: '_TransactionContextManager' object has no attribute '__code__'

root@unassigned:~# dpkg -l | grep -i neutron
ii neutron-common 2:12.0.0-0ubuntu1.3~cloud0 all Neutron is a virtual network service for Openstack - common
ii neutron-plugin-ml2 2:12.0.0-0ubuntu1.3~cloud0 all Neutron is a virtual network service for Openstack - ML2 plugin
ii neutron-server 2:12.0.0-0ubuntu1.3~cloud0 all Neutron is a virtual network service for Openstack - server
ii python-neutron 2:12.0.0-0ubuntu1.3~cloud0 all Neutron is a virtual network service for Openstack - Python library
ii python-neutron-fwaas 1:12.0.0-0ubuntu1~cloud0 all Firewall-as-a-Service driver for OpenStack Neutron
ii python-neutron-lib 1.13.0-0ubuntu1~cloud0 all Neutron shared routines and utilities - Python 2.7
ii python-neutronclient 1:6.7.0-0ubuntu1~cloud0 all client API library for Neutron - Python 2.7

root@unassigned:~# dpkg -l | grep -i pecan
ii python-pecan 1.0.2-2ubuntu1 all WSGI object-dispatching web framework - Python 2.x
ii python3-pecan 1.2.1-2~cloud0 all WSGI object-dispatching web framework - Python 3.x

gnocchi packages say python-pecan (>= 0.9) and neutron packages say python-pecan (>= 1.0.0)
these are available:

root@unassigned:~# apt-cache policy python-pecan
python-pecan:
  Installed: 1.0.2-2ubuntu1
  Candidate: 1.2.1-2~cloud0
  Version table:
     1.2.1-2~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main amd64 Packages
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main i386 Packages
 *** 1.0.2-2ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages
        100 /var/lib/dpkg/status

root@unassigned:~# apt-cache policy python3-pecan
python3-pecan:
  Installed: 1.2.1-2~cloud0
  Candidate: 1.2.1-2~cloud0
  Version table:
 *** 1.2.1-2~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main amd64 Packages
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main i386 Packages
        100 /var/lib/dpkg/status
     1.0.2-2ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial/universe i386 Packages

why would not the latest version of python-pecan get installed?
after upgrading to the proper version neutron-db-manage is working