Upgrading to pike resulted in incomplete installation

Using charm version 19.04 while upgrading neutron-api to pike, the apt upgrade does not handle errors properly.

The relevant snipped from the juju debug-log on the offending unit:

unit-neutron-api-1: 19:54:37 INFO unit.neutron-api/1.juju-log Upgrading OpenStack release
unit-neutron-api-1: 19:54:38 INFO unit.neutron-api/1.juju-log Performing OpenStack upgrade to pike.
unit-neutron-api-1: 19:54:38 INFO unit.neutron-api/1.juju-log DEPRECATION WARNING: Function configure_installation_source is being removed on/around 2017-07 : use charmhelpers.fetch.add_sou
rce() instead.
unit-neutron-api-1: 19:54:39 INFO unit.neutron-api/1.juju-log Installing [] with options: ['--option=Dpkg::Options::=--force-confold']
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade The following packages were automatically installed and are no longer required:
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade libboost-iostreams1.58.0 libboost-random1.58.0 libboost-system1.58.0
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade libboost-thread1.58.0 python-barbicanclient python-os-win
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade python-pyasn1-modules
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Use 'apt autoremove' to remove them.
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade 0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Ign:1 http://packages.elastic.co/beats/apt stable InRelease
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Get:2 http://packages.elastic.co/beats/apt stable Release [1797 B]
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Hit:3 http://ppa.launchpad.net/landscape/17.03/ubuntu xenial InRelease
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Ign:5 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/pike InRelease
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Ign:7 https://artifacts.elastic.co/packages/5.x/apt stable InRelease
unit-neutron-api-1: 19:54:39 DEBUG unit.neutron-api/1.openstack-upgrade Hit:8 https://artifacts.elastic.co/packages/5.x/apt stable Release
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Hit:9 http://archive.ubuntu.com/ubuntu xenial InRelease
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Hit:10 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/pike Release
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Hit:13 http://ppa.launchpad.net/landscape/18.03/ubuntu xenial InRelease
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Hit:14 http://archive.ubuntu.com/ubuntu xenial-updates InRelease
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Hit:15 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
unit-neutron-api-1: 19:54:40 DEBUG unit.neutron-api/1.openstack-upgrade Fetched 1797 B in 1s (1774 B/s)
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:54:41 INFO unit.neutron-api/1.juju-log Upgrading with options: ['--option', 'Dpkg::Options::=--force-confnew', '--option', 'Dpkg::Options::=--force-confdef']
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Calculating upgrade...
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade The following packages were automatically installed and are no longer required:
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade libboost-iostreams1.58.0 libboost-random1.58.0 libboost-system1.58.0
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade libboost-thread1.58.0 python-barbicanclient python-os-win
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade python-pyasn1-modules
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade Use 'apt autoremove' to remove them.
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade The following packages have been kept back:
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade neutron-common neutron-plugin-ml2 neutron-server python-neutron
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade python-neutron-fwaas python-sqlalchemy python-sqlalchemy-ext
unit-neutron-api-1: 19:54:41 DEBUG unit.neutron-api/1.openstack-upgrade 0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
unit-neutron-api-1: 19:54:43 INFO unit.neutron-api/1.juju-log Installing ['apache2', 'haproxy', 'memcached', 'neutron-plugin-ml2', 'neutron-server', 'python-keystoneclient', 'python-memcache', 'python-mysqldb', 'python-networking-hyperv', 'python-neutron-dynamic-routing', 'python-neutron-fwaas', 'python-neutron-lbaas', 'python-psycopg2', 'python-six', 'uuid'] with options: ['--option', 'Dpkg::Options::=--force-confnew', '--option', 'Dpkg::Options::=--force-confdef']
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade python-memcache is already the newest version (1.57-1).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade python-mysqldb is already the newest version (1.3.7-1build2).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade python-psycopg2 is already the newest version (2.6.1-1build2).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade python-six is already the newest version (1.10.0-3).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade uuid is already the newest version (1.6.2-1.5build2).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade apache2 is already the newest version (2.4.18-2ubuntu3.10).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade haproxy is already the newest version (1.6.3-1ubuntu0.2).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade memcached is already the newest version (1.4.25-2ubuntu1.4).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade python-keystoneclient is already the newest version (1:3.13.0-0ubuntu1~cloud0).
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade Some packages could not be installed. This may mean that you have
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade requested an impossible situation or if you are using the unstable
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade distribution that some required packages have not yet been created
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade or been moved out of Incoming.
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade The following information may help to resolve the situation:
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade The following packages have unmet dependencies:
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade neutron-common : Depends: python-neutron (= 2:10.0.5-0ubuntu1~cloud0) but 2:11.0.6-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade neutron-plugin-ml2 : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade neutron-server : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:43 DEBUG unit.neutron-api/1.openstack-upgrade E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
unit-neutron-api-1: 19:54:43 INFO unit.neutron-api/1.juju-log Couldn't acquire DPKG lock. Will retry in 10 seconds
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade python-memcache is already the newest version (1.57-1).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade python-mysqldb is already the newest version (1.3.7-1build2).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade python-psycopg2 is already the newest version (2.6.1-1build2).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade python-six is already the newest version (1.10.0-3).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade uuid is already the newest version (1.6.2-1.5build2).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade apache2 is already the newest version (2.4.18-2ubuntu3.10).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade haproxy is already the newest version (1.6.3-1ubuntu0.2).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade memcached is already the newest version (1.4.25-2ubuntu1.4).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade python-keystoneclient is already the newest version (1:3.13.0-0ubuntu1~cloud0).
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade Some packages could not be installed. This may mean that you have
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade requested an impossible situation or if you are using the unstable
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade distribution that some required packages have not yet been created
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade or been moved out of Incoming.
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade The following information may help to resolve the situation:
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade The following packages have unmet dependencies:
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade neutron-common : Depends: python-neutron (= 2:10.0.5-0ubuntu1~cloud0) but 2:11.0.6-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade neutron-plugin-ml2 : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade neutron-server : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:54:53 DEBUG unit.neutron-api/1.openstack-upgrade E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
unit-neutron-api-1: 19:54:54 INFO unit.neutron-api/1.juju-log Couldn't acquire DPKG lock. Will retry in 10 seconds
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade python-memcache is already the newest version (1.57-1).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade python-mysqldb is already the newest version (1.3.7-1build2).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade python-psycopg2 is already the newest version (2.6.1-1build2).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade python-six is already the newest version (1.10.0-3).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade uuid is already the newest version (1.6.2-1.5build2).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade apache2 is already the newest version (2.4.18-2ubuntu3.10).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade haproxy is already the newest version (1.6.3-1ubuntu0.2).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade memcached is already the newest version (1.4.25-2ubuntu1.4).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade python-keystoneclient is already the newest version (1:3.13.0-0ubuntu1~cloud0).
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade Some packages could not be installed. This may mean that you have
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade requested an impossible situation or if you are using the unstable
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade distribution that some required packages have not yet been created
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade or been moved out of Incoming.
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade The following information may help to resolve the situation:
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade The following packages have unmet dependencies:
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade neutron-common : Depends: python-neutron (= 2:10.0.5-0ubuntu1~cloud0) but 2:11.0.6-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade neutron-plugin-ml2 : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade neutron-server : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:04 DEBUG unit.neutron-api/1.openstack-upgrade E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
unit-neutron-api-1: 19:55:04 INFO unit.neutron-api/1.juju-log Couldn't acquire DPKG lock. Will retry in 10 seconds
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade Reading package lists...
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade Building dependency tree...
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade Reading state information...
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade python-memcache is already the newest version (1.57-1).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade python-mysqldb is already the newest version (1.3.7-1build2).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade python-psycopg2 is already the newest version (2.6.1-1build2).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade python-six is already the newest version (1.10.0-3).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade uuid is already the newest version (1.6.2-1.5build2).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade apache2 is already the newest version (2.4.18-2ubuntu3.10).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade haproxy is already the newest version (1.6.3-1ubuntu0.2).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade memcached is already the newest version (1.4.25-2ubuntu1.4).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade python-keystoneclient is already the newest version (1:3.13.0-0ubuntu1~cloud0).
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade Some packages could not be installed. This may mean that you have
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade requested an impossible situation or if you are using the unstable
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade distribution that some required packages have not yet been created
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade or been moved out of Incoming.
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade The following information may help to resolve the situation:
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade The following packages have unmet dependencies:
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade neutron-common : Depends: python-neutron (= 2:10.0.5-0ubuntu1~cloud0) but 2:11.0.6-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade neutron-plugin-ml2 : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade neutron-server : Depends: neutron-common (= 2:11.0.6-0ubuntu1~cloud0) but 2:10.0.5-0ubuntu1~cloud0 is to be installed
unit-neutron-api-1: 19:55:14 DEBUG unit.neutron-api/1.openstack-upgrade E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/neutron/neutron.conf
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/default/neutron-server
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/neutron/api-paste.ini
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/apache2/sites-available/openstack_https_frontend.conf
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/haproxy/haproxy.cfg
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/neutron/neutron_lbaas.conf
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/neutron/neutron_vpnaas.conf
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/neutron/plugins/ml2/ml2_conf.ini
unit-neutron-api-1: 19:56:03 INFO unit.neutron-api/1.juju-log Registered config file: /etc/memcached.conf
unit-neutron-api-1: 19:56:04 DEBUG unit.neutron-api/1.juju-log Hardening function '_harden_inner2'
unit-neutron-api-1: 19:56:04 DEBUG unit.neutron-api/1.juju-log No hardening applied to '_harden_inner2'
unit-neutron-api-1: 19:56:04 DEBUG unit.neutron-api/1.juju-log Hardening function 'update_status'
unit-neutron-api-1: 19:56:04 DEBUG unit.neutron-api/1.juju-log No hardening applied to 'update_status'
unit-neutron-api-1: 19:56:04 INFO unit.neutron-api/1.juju-log Updating status.
unit-neutron-api-1: 19:56:09 DEBUG unit.neutron-api/1.juju-log Generating template context for amqp
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status ERROR no relation id specified
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.juju-log Generating template context for identity-service
unit-neutron-api-1: 19:56:10 INFO unit.neutron-api/1.juju-log Inspecting identity-service relations for CA SSL certificate.
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Considering dependency setenvif for ssl:
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module setenvif already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Considering dependency mime for ssl:
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module mime already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Considering dependency socache_shmcb for ssl:
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module socache_shmcb already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module ssl already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module proxy already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Considering dependency proxy for proxy_http:
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module proxy already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module proxy_http already enabled
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.update-status Module headers already enabled
unit-neutron-api-1: 19:56:10 INFO unit.neutron-api/1.juju-log Making dir /etc/apache2/ssl/neutron root:root 555
unit-neutron-api-1: 19:56:10 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:11 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:11 INFO unit.neutron-api/1.juju-log Making dir /etc/apache2/ssl/neutron root:root 555
unit-neutron-api-1: 19:56:11 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:11 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:11 INFO unit.neutron-api/1.juju-log Making dir /etc/apache2/ssl/neutron root:root 555
unit-neutron-api-1: 19:56:11 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:11 DEBUG unit.neutron-api/1.juju-log Changing permissions on existing content: 33184 -> 416
unit-neutron-api-1: 19:56:12 DEBUG unit.neutron-api/1.juju-log Ensuring haproxy enabled in /etc/default/haproxy.
unit-neutron-api-1: 19:56:12 DEBUG unit.neutron-api/1.juju-log Ensuring haproxy enabled in /etc/default/haproxy.
unit-neutron-api-1: 19:56:13 DEBUG unit.neutron-api/1.juju-log VIP HA: VIP is set 10.10.20.178 103.77.104.178
unit-neutron-api-1: 19:56:13 DEBUG unit.neutron-api/1.update-status active
unit-neutron-api-1: 19:56:13 DEBUG unit.neutron-api/1.update-status active
unit-neutron-api-1: 19:56:13 DEBUG unit.neutron-api/1.update-status active
unit-neutron-api-1: 19:56:13 DEBUG unit.neutron-api/1.update-status active
unit-neutron-api-1: 19:56:13 INFO unit.neutron-api/1.juju-log Unit is ready

For the rest is there no reference to either the packages python-neutron-fwaas or python-neutron-vpnaas.
On the cloud the other 2 unit's upgraded fine, the resulting package versions of all three units are; https://pastebin.canonical.com/p/fbHfdsDGHY/

Due to the fact that python-neutron-fwaas & python-neutron-vpnaas where not upgrade the service was unable to start. The fix was: "sudo apt install python-neutron-fwaas python-neutron-vpnaas" which worked without a problem and / or a prompt for help packages etc, and resolved the non-working unit