[Bug 1945661] Re: openstack commands fail with GTK3 error

[eblock@nde.ag]

I found one way to get the openstack shell to work by installing
libgtk-3-dev (I found a hint in a search engine). Apparently,
python3-cmd2 requires python3-pyperclip which requires python3-gi and so
on. Is this really the required way? I didn't notice anything in the
release notes (maybe I missed it). When comparing to a different
environment (Victoria on baremetal) I see that libgtk-3 is installed
there (not -dev though), but with libgtk-3-0 only the error message was
still present. So the question is, which dependencies are missing where?
It's not really obvious to me. Could this already be fixed in Xena? If
it is fixed there I could do the double upgrade, of course, especially
since Wallaby is already under extended maintenance.

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https://bugs.launchpad.net/bugs/1945661

Title:
  openstack commands fail with GTK3 error

Status in python-openstackclient package in Ubuntu:
  Confirmed

Bug description:
  Openstack release: Wallaby
  OS: Ubuntu 20.04 server edition
  After installation of python3-openstackclient from apt, while setting up user, roles and project, I executed following command: 
  openstack domain create --description "An Example Domain" example

  Error: 
  Traceback (most recent call last):
    File "/usr/bin/openstack", line 6, in <module>
      from openstackclient.shell import main
    File "/usr/lib/python3/dist-packages/openstackclient/shell.py", line 23, in <module>
      from osc_lib import shell
    File "/usr/lib/python3/dist-packages/osc_lib/shell.py", line 24, in <module>
      from cliff import app
    File "/usr/lib/python3/dist-packages/cliff/app.py", line 22, in <module>
      import cmd2
    File "/usr/lib/python3/dist-packages/cmd2.py", line 585, in <module>
      _ = pyperclip.paste()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 667, in lazy_load_stub_paste
      copy, paste = determine_clipboard()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 558, in determine_clipboard
      return init_gi_clipboard()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 167, in init_gi_clipboard
      gi.require_version('Gtk', '3.0')
    File "/usr/lib/python3/dist-packages/gi/__init__.py", line 129, in require_version
      raise ValueError('Namespace %s not available' % namespace)

  Had to install GTK3 to make openstack commands work but it is taking
  huge time to get a response to the commands. The wait time after
  firing any openstack cli command is around 30 seconds.

  Anybody faced the issue? What is the fix for it if it exists?

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