openstack-dashboard failed to install because of collectstatic not found

[Vincent Brouillard]

While trying to install openstack-dashboard it failled with the error:

WARNING:root:"dashboards" and "default_dashboard" in (local_)settings is DEPRECATED now and may be unsupported in some future release. The preferred way to specify the order of dashboards and the default dashboard is the pluggable dashboard mechanism (in /usr/share/openstack-dashboard/openstack_dashboard/enabled, /usr/share/openstack-dashboard/openstack_dashboard/local/enabled).
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 204, in fetch_command
    app_name = commands[subcommand]
KeyError: 'collectstatic'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 25, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 211, in fetch_command
    settings.INSTALLED_APPS
  File "/usr/local/lib/python3.6/dist-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/usr/local/lib/python3.6/dist-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/local/lib/python3.6/dist-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/share/openstack-dashboard/openstack_dashboard/settings.py", line 522, in <module>
    XSTATIC_MODULES, HORIZON_CONFIG)
  File "/usr/share/openstack-dashboard/openstack_dashboard/utils/settings.py", line 260, in get_xstatic_dirs
    module = import_module(module_name)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'horizon.xstatic'
dpkg: error processing package openstack-dashboard (--configure):
 installed openstack-dashboard package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of openstack-dashboard-ubuntu-theme:
 openstack-dashboard-ubuntu-theme depends on openstack-dashboard (= 3:15.1.1-0ubuntu1.1~cloud0); however:
  Package openstack-dashboard is not configured yet.

============
lsb_release -rd

Description: Ubuntu 18.04.3 LTS
Release: 18.04

============
apt-cache policy openstack-dashboard

openstack-dashboard:
  Installed: 3:15.1.1-0ubuntu1.1~cloud0
  Candidate: 3:15.1.1-0ubuntu1.1~cloud0
  Version table:
 *** 3:15.1.1-0ubuntu1.1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-updates/stein/main amd64 Packages
        100 /var/lib/dpkg/status
     3:13.0.2-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
     3:13.0.0-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

[Vincent Brouillard (vnuke)]

I managed to install the requirements of stein to repair the install afterwards using pip and pip3

sudo pip install -c https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/stein -r https://raw.githubusercontent.com/openstack/horizon/stable/stein/requirements.txt

sudo pip3 install -c https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/stein -r https://raw.githubusercontent.com/openstack/horizon/stable/stein/requirements.txt

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.