Public bug reported:

The upgrade process from Queens to Rocky fails due to a failure to override a 
policy file:
https://paste.ubuntu.com/p/tH4qrvP7mS/

The issue causes an upgrade action to exit prematurely which leaves the
dashboard in a broken state as the keystone v3 policy json file is not
rendered.

KEYSTONEV3_POLICY = ('/usr/share/openstack-dashboard/openstack_dashboard/conf/'
                     'keystonev3_policy.json')


This is reproducible without charms by simply doing the following:

lxc launch ubuntu:bionic neutrontest
Creating neutrontest
Starting neutrontest

lxc exec neutrontest bash
root@neutrontest:~# apt update
root@neutrontest:~# apt install python-neutron-fwaas-dashboard
# ... https://paste.ubuntu.com/p/RMKbNH5DbB/

root@neutrontest:~# add-apt-repository cloud-archive:rocky
root@neutrontest:~# python3-neutron-fwaas-dashboard
https://paste.ubuntu.com/p/4Fq9MvpP9p/

Unpacking python3-neutron-fwaas-dashboard (1.5.0-0ubuntu3~cloud0) ...
dpkg: error processing archive 
/tmp/apt-dpkg-install-R0ZsZb/111-python3-neutron-fwaas-dashboard_1.5.0-0ubuntu3~cloud0_all.deb
 (--unpack):
 trying to overwrite '/etc/openstack-dashboard/neutron-fwaas-policy.json', 
which is also in package python-neutron-fwaas-dashboard 1.3.0-0ubuntu1.1


The same issue in an output of execution of a charm action (19.04):

2019-05-08 14:38:12 DEBUG openstack-upgrade  
/tmp/apt-dpkg-install-3M5oD6/099-python3-neutron-fwaas-dashboard_1.5.0-0ubuntu3~cloud0_all.deb
2019-05-08 14:38:14 DEBUG openstack-upgrade E: Sub-process /usr/bin/dpkg 
returned an error code (1)
2019-05-08 14:38:14 INFO juju-log Couldn't acquire DPKG lock. Will retry in 10 
seconds
2019-05-08 14:38:24 DEBUG openstack-upgrade Reading package lists...
2019-05-08 14:38:24 DEBUG openstack-upgrade Building dependency tree...
2019-05-08 14:38:24 DEBUG openstack-upgrade Reading state information...
2019-05-08 14:38:24 DEBUG openstack-upgrade libapache2-mod-wsgi-py3 is already 
the newest version (4.5.17-1).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-pymysql is already the 
newest version (0.8.0-1).
2019-05-08 14:38:24 DEBUG openstack-upgrade haproxy is already the newest 
version (1.8.8-1ubuntu0.4).
2019-05-08 14:38:24 DEBUG openstack-upgrade memcached is already the newest 
version (1.5.6-0ubuntu1.1).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-memcache is already the 
newest version (1.57-2ubuntu0.18.04.1).
2019-05-08 14:38:24 DEBUG openstack-upgrade openstack-dashboard is already the 
newest version (3:14.0.2-0ubuntu2~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade openstack-dashboard-ubuntu-theme is 
already the newest version (3:14.0.2-0ubuntu2~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-designate-dashboard is 
already the newest version (7.0.0-0ubuntu1~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-django-horizon is already 
the newest version (3:14.0.2-0ubuntu2~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-heat-dashboard is already 
the newest version (1.4.0-0ubuntu1~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-keystoneclient is already 
the newest version (1:3.17.0-0ubuntu1~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-neutron-lbaas-dashboard is 
already the newest version (5.0.0-0ubuntu1~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade python3-novaclient is already the 
newest version (2:11.0.0-0ubuntu1~cloud0).
2019-05-08 14:38:24 DEBUG openstack-upgrade The following packages were 
automatically installed and are no longer required:
2019-05-08 14:38:24 DEBUG openstack-upgrade   python-pika-pool 
python-positional python-retrying
2019-05-08 14:38:24 DEBUG openstack-upgrade Use 'apt autoremove' to remove them.
2019-05-08 14:38:24 DEBUG openstack-upgrade The following NEW packages will be 
installed:
2019-05-08 14:38:24 DEBUG openstack-upgrade   python3-neutron-fwaas-dashboard
2019-05-08 14:38:25 DEBUG openstack-upgrade 0 upgraded, 1 newly installed, 0 to 
remove and 0 not upgraded.
2019-05-08 14:38:25 DEBUG openstack-upgrade 109 not fully installed or removed.
2019-05-08 14:38:25 DEBUG openstack-upgrade Need to get 0 B/55.6 kB of archives.
2019-05-08 14:38:25 DEBUG openstack-upgrade After this operation, 630 kB of 
additional disk space will be used.
(Reading database ... 81446 files and directories currently installed.)
2019-05-08 14:38:25 DEBUG openstack-upgrade Preparing to unpack 
.../python3-neutron-fwaas-dashboard_1.5.0-0ubuntu3~cloud0_all.deb ...
2019-05-08 14:38:25 DEBUG openstack-upgrade Unpacking 
python3-neutron-fwaas-dashboard (1.5.0-0ubuntu3~cloud0) ...
2019-05-08 14:38:25 DEBUG openstack-upgrade dpkg: error processing archive 
/var/cache/apt/archives/python3-neutron-fwaas-dashboard_1.5.0-0ubuntu3~cloud0_all.deb
 (--unpack):
2019-05-08 14:38:25 DEBUG openstack-upgrade  trying to overwrite 
'/etc/openstack-dashboard/neutron-fwaas-policy.json', which is also in package 
python-neutron-fwaas-dashboard 1.3.0-0ubuntu1.1
2019-05-08 14:38:25 DEBUG openstack-upgrade Errors were encountered while 
processing:
2019-05-08 14:38:25 DEBUG openstack-upgrade  
/var/cache/apt/archives/python3-neutron-fwaas-dashboard_1.5.0-0ubuntu3~cloud0_all.deb
2019-05-08 14:38:27 DEBUG openstack-upgrade E: Sub-process /usr/bin/dpkg 
returned an error code (1)
2019-05-08 14:38:27 INFO juju-log Couldn't acquire DPKG lock. Will retry in 10 
seconds

** Affects: charm-openstack-dashboard
     Importance: Undecided
         Status: New

** Affects: neutron-fwaas-dashboard (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cpe-onsite

** Also affects: neutron-fwaas-dashboard (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1828293

Title:
  [Queens -> Rocky Upgrade] python3-neutron-fwaas-dashboard
  installation: trying to overwrite '/etc/openstack-dashboard/neutron-
  fwaas-policy.json', which is also in package python-neutron-fwaas-
  dashboard

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